THE MINERAL CONCHOLOGY OF GREAT BRITAIN V03, SOWERBY 1812 to 1834

THE

MINERAL CONCHOLOGY
OF

GREAT BRITAIN;
OR

COLOURED FIGURES AND DESCRIPTIONS
OF THOSE

REMAINS OF TESTACEOUS ANIMALS
OR

WHICH HAYE BEEN PEESERVEB AT VARIOUS TIMES AND DEPTHS

IN

THE EARTH.

By JAMES SOWERBY, F.L.S.

G.S. W.S.

HONORARY MEMBER OF THE PHYSICAL SOCIETY OF GOTTINGEN, OF
THE SOCIETY OF JENA, &C.

AUTHOR OF BRITISH MINERALOGY, EXOTIC MINERALOGY,
TISH MISCELLANY, ENGLISH FUNGI, A BOTANICAL
DRAWING BOOK, AND A NEW ELUCIDATION
OF COLOURS

BRI-

;

DESIGNER OF ENGUSH BOTANY,

^e.

Many, O Lord my God, are thy wonderful works which thou hast done;
they cannot be reckoned up in order to thee: if I would declare and speak
of them, they are more than can be numbered.
Psalm

VOL.

xl. 5.

III.

LONDON:
Printed by

And

W. ARDING,

21,

Old Boswell Court, Carey

Street.

by the Author, J. Sowerby, No. 2, Mead Place, Lambeth;
Longman and Co. and Sherwood and Co. Paternoster Row, &c.
sold

MDCCCXXL



1

PECTEN

cornea.

TAB. CCIY.
Spec. Char.

Orbicular,

much

nearly equal

ears small,

depressed, smooth
•

*

two obtuse teeth

near the ears within each valve.

-A.

THIN fragile

shell

whose Talves are very nearly

being both of them very
acute

;

flat

and shining

the ears prominent and well defined

of each within the valves

is

:

;

alike^

the beak

is

at the base

an obloug blunt tooth

slight difference observable in the relative position

these teeth points out the two valves most readily.

:

a
of

Well

preserved individuals retain some traces of the original

markings
like

such are of a deep brown colour with a horn-

;

transparency on the sides, and of an opaque pale

brown from

the front to the beak, near which the colours

are very distinct

:

other specimens are altogether of a

pale brown colour, these are the most tender.

Found

Blue 3Iarle stratum below high water
in Hampshire.
It has much affinity with Pecten Pleurouectes, but is more slender, and
in the

mark, at Stubbington,
otherways distinct.
difficult to

preserve

Mr. Holloways
such as

Perfect specimens are very rare, and
;

I

am

therefore

much

oblisred to

for the pains he has taken to procure

exliibit clearly all the characters.

me



s

PECTEN

obscura.

TAB. CCV.— F/g-.
Spec.

Sub-orbicular, depressed, with oblongitudinal rugse upon the

Char.

arched

scure
surface

Somewhat

1.

;

ears large.

longer than wide

:

the surface

is

dull,

almost

furrows.
has some indications of diverging

smooth but it
The edge is thick.
of Stonesfield,
Occurs upon the sandy Limestone slate
to me long
forwarded
near Oxford. My specimen was
;

since by Dr. Williams.

PECTEN
Tx\B.

lens.

CCV.— Figs.

2

and

3.

Orbicular, convex; surface marked
diverging arched striae; strise deeply

Spec. Char.

wilh

punctured.

Nearly
shell

near the beaks; t!ie
remains are much broken

lenticular, but thickest

seems to be tender, as

its

my specimens.
the ears are not perfect in either of
produce of t'ue forest marble near Oxford.

A


PECTEN

laminata.

TAB. CCY.-^Fig,
Char.

Spec.

arched, diverging

striee

equal

A HE

Suborbicular^

striae

;

4.

depressed^

striated;

ears triangular^ un-

:

the largest plaited.

are slij^htly undulated; to the naked eye they

appear smooth, but when carefully examined with a
lense,
plaits

minute lines may be traced across them. The
upon the ear form a strong character, whence the

name.

In shelly Limestone (Cornbrash)

Chatley Lodge,

at

in Somersetshire.

PECTEN
TAB.
Spec. Char.

arcuata.

CCV— Figs.
Orbicular,

:

ears large

;

7.

with arched

upon the

stride

sur-

the side beneath the largest

arched.

is

A. SMALL

shell, prettily

marked with arched,

sometimes forked farrows.

largest

and

depressed,

punctured and diverging
face

5

is

quadrangular

;

The

;

the

they are both punctured.

I have a single valve of this

along with Ostrea gregarea

(tab.

(fig.

7.)

111.

Devizes, and another upon Coral rag
perfect.

and

dotted,

ears are dissimilar

f.

in sandstone,
1

(fig. 5.)

&

3.)

from

but not so

PECTEN similis.
TAB. CCV.— Fig. 6.
Char.

Spec.

Suborbicular^ depressed^

striated

;

archedj diverging; ears unequal; sides

striaB

straight.

1

HIS differs from the last in having a straight side be-

neath the larger ear, in being long^er, and having no dots
first sight it much resembles it.
Limestone, probably belonging to the
Forest Marble, from Shotover Hill, Oxford.

in the striae

Upon

;

but at

shelly

PECTEN

rigida.

TAB. CCV.—Fig.
Char.

Spec.

striated;

Orbicular,
stride

8.

depressed

;

strongly

arched, diverging; ears large,

unequal, decussated.

A LARGER
shorter,

From
the Rev.

shell than the last, which it resembles, but
and has fewer and deeper striae.

is

Castle Combe, in Forest Marble, by favour of
H. Steiuhauer.



CUCULL^A

oblonga.

TAB. CCYL—Figs.
Syn.

CucullEea oblonga.

Spec. Char.

Miller,

and

2.

MSS.

Transversely oblongs gibbose^ lon-

gitudinally

shaped

1 HE width

i

striated

lines

;

anterior

;

wedge-

side

beneath the cartilage numerous.

of this Cucullaeais above twice

its

length

the front inclines slightly to the posterior side, which

:

is

upon the surface are numerous, irreguThe beaks are
the edge is entire.
lar, and elevated
the flat rhomboidal space between
elegantly incurved
small

the

:

striae

:

;

them

marked with from 9

is

The

specimen of

finest

pair figured

it

:

much

labour and perseverance by Mr.

J. S. Miller, of Bristol.

me

parallel lozenges.

belongs to a valuable collection that has

been made with
also sent

12

to

this shell as yet obtained is the

G.

W.

Braikenridge, Esq. has

a good example.

at Dundry in the
The single
ore.

They were both found

inferior Oolite, holding grains of iron

valve represented was sent

me by

the

it is in the
Rev. Mr. Steinhauer, from Cross Hands
same kind of stone. I regret that a single valve exhibiting the teeth more perfectly, which I have just received
from Mr. Miller, did not arrive time enough for me to
:

alter the figure.

It

shews the

lateral plates bent at right

angles near their bases where they approach the middle

Mr. Steinhauer has

of the hinge.

from

little

also sent

me fragments

Sodbury.

The name

is

that

Mr. Miller has given

and

in a catalogue of

lent

me

some valuable

for publication.

it

in his letters,

shells

he has kindly


CUCULL^A

decussata,

TAB, CCVL--Figs.
Cucullaea decussata.

Syn.

Char.

Spec.

Transversely ovate
longitudinal ridges

gular

lines

wA-BOUT

one-fiftli

4.

Parkinson III. 171.

flattish
;

and

3

;

g-ibbose^ with

anterior side an-

;

beneath the cartilage

wider than long

:

few^.

the ridges are but

and are decussated by fine and close lines
the interior margin in old shells is crenu-

elevated,

little

of growth
lated

:

:

the teeth of the hinge,

when they

are not worn,

are striated or crenulated upon their Sides, as I have ob-

served when speaking of C. glabra, (Vol.

I. p.

T received this from the same gentleman

152, t.67.)

who

sent Mr.

Parkinson the specimens he describes, Mr. Francis Crow,

who

collected

them

all

near Faversham, in Kent

:

they

are silicious casts, with a small portion of the shell re-

maining.


CUCULL^A

carinata.

TAB. CCYIL— Fig.
Spec.

Char.

Obliquely cuneiform, smooth

ridg-e running"

up

to the beak.

i^ENGTH and breadth nearly equal
bounds the anterior

side bein^

but the rid^e that

one

is

acuteness of the angle

the anterior side, with the remaining surface,

from C. glabra

sufficient to distinguish this

smoothness of the surface

A

;

very oblique,

The

sixth longer than the width.

made by

an-

;

and distinguished by a

pointed,

side

terior

i.

silicious cast

may

arise

(tab. 67.)

is

the

from wear.

from Black Down.

CUCULLtEA fibrosa.
TAB. CCVIL— Fig. 2.
Spec. Char.

Obovate,

gibbose,

logitudinal elevated striae

margin

terior

straight,

with

upon the

numerous

surface

;

an-

prominent near the

hinge.

liENGTH

less than the

C

the lines

width
but

;

in its

general aspect

much

oblique, and the
more gradually rounded unto the middle
upon the surface are sharp, and frequently

resembling

anterior side

glabra,

it is

less

is

crossed by the lines of growth.

Cast

in

Calcedony, in a sandstone holding mica and

green sand; found at Black

me by Miss E.

Hill.

Down, and

transmitted to



ti

TRIGONIA eccentiica.
TAB. CCVIIL— F/g'5. and 2.
1

Trigonia eccentrica.

Syn.

p. 175. tab. 12. /.

Parkinson,

rior side produced,

iii.

5.

Transversely ovate,

Spec. Citar.

vol.

convex; ante-

posterior side round,

vi^ith

oblique undulating ridges on the surface.

The length is

only half the width

;

the edge

is

very re-

comes to the produced part of the
anterior side, where it bends a little forward, and then
The ridges are straight and transturns suddenly back.
gularly curved

till it

verse near the beaks where they almost cross the shell
those placed nearer the front are confined to the posterior
the lines of
side, are undulated, and are crossed by

growth,

two views of one valve, which was found
on Black Down by the Rev. J. H. Steinhauer it is
I have the
silex, stained perhaps by vegetable matter.
opposite valve imperfect from Hembury Fort, Devonalso silicious.
shire, through the hands of Mr. Goodhall:
I have o-iven

;

TRIGONA

affinis.

TAB. CCYin.—Fig.
Trigona

Syn.

affinis.

Miller,

3.

MSS.
gibbose,

half

thick, regularly elliptical, about one-third

wider

Spec. Char.

Transverse,

oval,

covered by transverse ridges.

Very

than long, and

remarkable for the slight protuberance of

the beak, behind which there
in Corbula,

is

and many other

not that cavity observable
shells.

The

transverse


12
ridges are very uniform, and somewhat inversely imbricated.

The

anterior half

The handsome mass
this rare

species rests,

Mr. Miller
collection,

;

it is

from

smooth.

upon which
public use by

of silicized shells,

was sent

named
its

is

me

affinis in

for

the catalogue of his

resemblance, although distant, to

Triffonia sinuata of Parkinson.

13

CORBULA.
sided

valves

dissimilar unequal-

two

Shell with

Gen. Char.

La March,

Bruguiere.

Hinge

sub-transverse.

;

two, one in each valve

;

teeth

ligament internal.

of the most easily defined genera, being well disone
tini^uished by the dissimilarity of the valves, of which

One

and
generally so small as to be included in the other,
valve,
larger
the
by the single recurved conical tooth in
the
and a corresponding pit with an irregular tooth
with inother both valves are more or less gibbose,
ancurved beaks, a projecting and sometimes recurved
are
recent,
and
fossil
Several species, both
side.
is

m

:

terior

described

;

some are

slender, others very stout shells.

CORBULA

gigantea.

TAB. CClX,—Figs.
Spec. Char.

when

Gibbose,

when young

old transversely oblong

produced,

and

5, 0,

surface

recurved;

furrowed near the beaks

;

7.

suborbicular,
anterior side
concentrically

posterior side beset

;

with short spines.
have the furrows and ribs between, which
are equal and very regular, extended over the whole

Young

shells

surface of both valves

;

they are broadest over the middle,

and gradually diminish to the sides
in size,

the

the ribs are closer,

front,

and

at length

and

:

as the shell increases

prominent towards

less

disappear

:

when

full

grown,

short obtuse spines placed in longitudinal rows occupy


14

The

the posterior side and part of the front.
side

The

substance

which

is

This

is

very thin, except that of the hing-e,

strong.
shell is

abundant

Devonshire, Whetstone
his

3d

posterior

very concave, and separated by an obtute ridge.

is

Vol. p. 226.

I

:

in
it is

sandstone, called in

have received

of growth from ray kind

Miss E.

the

mentioned by Parkinson
it

in

in various stages

and amiable correspondent,

Hill.

CORBULA

lavigata.

TAB. CClX.--Figs.

1

find 2.

Spec. Char.
Orbicular, gibbose, smooth,
thin ; beaks prominent, incurved.

and

VERY smooth regularly convex thin shell, scarcely
I have only seen one, that is the
smaller valve, and only an imperfect specimen of that
but it shews the hinge, in which it exactly agrees with
i\.

wider than long.

C. gigantea.
cies is situated

The

tooth in this valve in both these spe-

upon the posterior edge of the

pit that

receives the tooth of the other valve, in which they differ

from other Corbulae, although
traces of such a disposition.

From Black Down, by

in

some of them there are

favour of Miss E. Hill.

CORBULA

globosa.

TAB. CClX.—Fig,

3.

Spec. Char.
Globose, smooth ; anterior side of
the larger valve produced into a lip ; truncated ; beaks equal.

A VERY

small shell, equal in thickness to

the posterior side

is

its length
round, the anterior obscurely trun;


15

cated,

and the front obtuse

protruded in the form of a

is

of the other valve

I say in

:

is

always a

little

the

bent,

beyond the anterior side

lip

many

have a considerable number that
than the want of this

many specimens

in

:

margin of the larger valve, which

specimens, because I

differ in

no other respect

they can hardly be younger, as
they are mostly of the same, or even of a larger size.

Very abundant

lip

;

Highgate Hill, frehave never met with a divided

in the blue clay of

quently in clusters

;

and

I

pair.

CORBULA

Pisum.

TAB. CCIX.— jPzV
Spec. Char.

Subglobose^ irregular, concentrically

furrowed

anterior side

;

sliohtly

margin of one valve produced

A

RUGGED looking

v*»ry

4.

;

truncated

;

beaks unequal.

shell
the beak of the larger valve is
prominent, even ventricose, especially in oldsubjects
;

;

the expanded margin extends beyond the anterior side of

the smaller valve, and a considerable part of

The

furrows are commonly worn away

stance, together with
it

some

;

tlie front.

which circum-

irregularity in the shape, give

the aspect of a shell that inhabits holes in stone.

Several of
this

my

correspondents have favoured

from Barton and Hordle

Cliffs

:

among

me

with

others Miss

Bennett, the Rev. Mr. Iremonger, and the Rev. Mr.
Bingley, wherefore I suppose it is a very common species
there, although not noticed by Brander.


16

CORBULA

revoluta.

TAB. CClX.—Figs.
Syn. Tellina revoluta.
Spec. Char.

8 to 13.

Bi^occhi b\6.

tab. 12./. 6.

Transversely oblong', tumidj trans-

versely furrowed

;

anterior side produced, trun-

cated, with a carina

running

beak

to the

;

mar-

gin of the larger valve prominent, inflected;

beaks unequal.
Var.

deep

transverse furrows few,

(costata)

/3

anterior side

rather

pointed^

(fi»s.

11,

12^

and 13.)

J.

HE width

is

frequently twice the length

the lesser valve

is

the edge of

;

almost wholly enclosed in the larger,

the margin of which at the front i» expanded, and rather

bent inwards, whence the

name given by

anterior side of the larger valve

is

Brocehi.

extended

in the

The

form of

a truncated beak, but liable, as well as the general form,

to such irregularities as are
bit holes

and cracks

and sharp, except

common

in rocks

in var.

/3,

;

S^alve is

which inha-

which has them rounded, and

the ridges between them sharp.

'

to shells

the furrows are numerous

The beak

of the larger

very gibbose in old shells.

From Barton

Cliff

by favour of the Rev. Mr. Bingley,

some have the furrows so irregular that it is
difficult to say to which variety they belong, otherwise I
should have been led by the general form to consider the

in plenty

var.

/3

;

a distinct species.


17

MODIOLA

subcarinata?

TAB. CCX.—Fig.
M.

Syn.

subcarinata
ris 191

?

1.

La March, Foss. de PaMuseum a' His-

Annates du

toire Xaturelle,

VL

Vol.

p. 122.

V.

IX. tab. 17./ 10.
Oblong, smooth, gibbose
Spec. Char.
side keel formed, rather obtuse
convex ; front concave.

;

anterior
;
posterior lobe

arched inwards in this shell;
edge is straight.
whereas in M. modiolus of Linn, that
is above twice
obliquely,
taking the measure

The margin of the front is

The

length,

modiolus of Linn. It
the width, and greater than in M.
the lines of growth, and is
is often strongly marked by
very pearly beneath a thin brown epidermis.
subcarinata of La
This is probably not the Modiola
description ; but I
Marck, although it agrees with the

must consider

it

as such until I obtain the

tinguishing them.
ties of

It

may

means of

dis-

probably be one of the varie-

MytiUus modiolus of Brocchi

;

but as that author,

varieties of rewho is apt to treat fossil species as only
instance, it is not easy
cent shells, does so in the present
The specimens figured are the
to determine this point.
much

Highgate Hill. The large one has been

produce of
appears to retain
broken by pressure, but the small one
its

original form undisguised.

MODIOLA bipartita.
TAB. CCX.— F/g-s. 3 and 4.
Elongated, smooth, rather gibbose ;
above the
anterior side obtuse, suddenly raised
irregular.
lobe
posterior ; posterior

Spec Ckar.

but readily
related in general form to the last,
lobe
posterior
the
of
separation
distinguished, by the

Nearly

1.8

from the remainder of the

shell

by a kind of step parti-

cularly prominent near the beak
also

;

the length

is

greater

the carinated form of the beak not so evident

;

and the front edge has two or three waves

The

regular curve.

shell

in place of

a

seems to be very thin and not

pearly.

Casts of this in ferruginous indui'ated marl, with
all the shelly remains worn off, have been forwarded to me by Miss jE. Hill, who obtained them
from Lantrissent near Cardiff. Similar casts occur at
Osraington ; he plate contains two views of one &f
these that was given rae by Miss Benett. Fig. 3 is from

nearly

an imperfect cast
Park, in Sussex

in
I

:

ferruginous sand, from

received

it

MODIOLA

^qualis.

TAB. CCX.— jP/g-.
Spec. Char.
lobe

Oblong-,

largC;,

is

2.

convex, smooth, anterior

obscurely defined.

The regular curvature
angle,

Parkham

from G. A. Mantell, Esq

of the margin which presents no

a striking feature in this Modiola

:

the two ends

are nearly equal in width, and the posterior lobe almost
as large as the remainder of the valve, and very gradually united with

it.

A cast in loose
Park,

in

The length

is

about twice the width,

ferruginous sandstone, from

Sussex, by G. A. Mantell, Esq.

Parkham

19

MODIOLA minima.
TAB. CCX.— Figs. 5, 0, and

7.

Ovato-subtriangular, smooth

Spec. Char.

;

front

nearly straight^ ends rounded^ posterior lobe
small, distinct.

Only

half as long again as wide:

is

it

vary broad

the margin forms a

anteriorly, and has small beaks
prominent angle with the hinge line at their junction.
;

This occurs in a grey argillacious Limestone the
largest was sent me from Taunton, by my friend R.
Hare, Esq. One of the small ones was found near Bel;

fast,

by Dr. M'Donnel, along with Gryphites.

MODIOLA

cuneata.

TAB. CCXl.-'Fig,

Elongated, convex, smooth

Spec. Chau.
rior part

cuneated

concave

ly

1.

;

;

back arched

;

;

ante-

front slight-

posterior side distinct, convex.

twice as long as wide; most gibbose near the
forward end
heaks, and gradually depressed towards the
in the form of a wedge.

AnouT

From

the inferior Oolite of Somersetshire.

MODIOLA gibbosa.
TAB. CCXl.— Fig.

Syn.

Modiola anatina.
Elongated,

Spec Char.
smooth

;

Smith Strat. Si/stem 89.
reniform, very gibbose,

back broad, arched.

ISTearly three times as long as wide
valve

is

2.

equal to

its

width.

;

the depth of each

The end

is

obtuse, not


29
wedge-shaped as
guishes

it

in the last,

in all ages.

The

a character that

posterior lobe

and gibbosc.
I have several specimens of

this shell

is

from Bradford,

Wilts, and from Claverton Hill, near Bath.
it

distin-

well defined

I believe

belongs to Smith's FuUers'-earth Rock.

MODIOLA
TAB.
Spec.

Char.

anterior

CCXL— F/g-.

Oblong,
lobe

reniformis.
3e

sub-reniform,

slightly

expanded

;

smooth

;

posterior

lobe small.

A

MORE obtuse and

less

comparatively compressed

curved
:

shell than the last,

the length

is

and

about twice the

width.

This

shell, of

which I have seen but one specimen,

said to be from the inferior Oolite, near Bath,

is


MODIGLA imbricata.
TAB. CCKlL'-'Figs.
Spec. Char.
ridges

elongated

Oval,

upon the surface

;

l
;

and

3,

with imbricated

back angular, front

concave.

A HIS

is

as broad

a slightly compressed shell
;

the ridges

;

about twice as long

upon the surface are the edges of

the shell left prominent after each successive addition to
its

margin during

its

growth.

The anterior

lobe forms a

slightly elevated ridge extending to the beak.

The Rev. T. O. Marsh sent me the specimen (fig. 3)
from Felmarsham, near Bedford.
I have had larger
casts brought me from Milton Ernest, also in Bedfordshire,

by Mr. Goodhall, who has kindly favoured me

with several shells obtained by him in the course of a
short tour.
Fig. 3 is from a much compressed and bro-

ken

shell,

taken out of clayey Limestone, found in an

alluvial deposit in the parish of Gisleham, near
toff,

in Suffolk,

Lowes-

by the friendly Mr. Thurtell.

MODIOLA Hillana.
TAB. CCXIL—-Fig. 2.
Spec. Char.

Depressed, elongato-ovate, concen-

trically striated

slightly

An

posterior

,•

concave

;

end narrow

front

;

posterior lobe obscure.

elegantly formed shell, rather more than twice as

long as wide

;

the back forms a kind of keel from the

centre of which the shell tapers towards the beaks

;

these

are not very prominent; and together with the small

22
convexity of the posterior lobe, give that end a narrow
contour.

The

striae

the lines of growth

;

are obtuse ridges coinciding with

they are smooth.

Miss E. Hill, whose kindness I have often had occame this shell from Pickeridge
Hill, near Roundsford Park, Taunton.
It is found in a
grey argillacious Limestone, that is in some parts so soft

sion to acknowledge, sent

and loose that the

shells

may be picked

in other parts the stone

strongly to
is

it,

in

is

firm,

out of it with ease j

and the

shell adheres

which case the surface of the

shell that

exposed by fracture has a glistening velvety lustre,
its crystalline structure.
The specimens

arising from

are frequently narrower than the figure.

MODIOLA aspera.
TAB. CCXlL-^Fig\

4.

Spec. Char. Ovate^ elongated^ posteriorly pointed ;

very g'ibbose,
elevated^

longitudinally striated;

rough,

very numerous

;

stride

posterior

lobe obscure^ wrinkled, small.

1 HE small and nearly flat posterior lobe leaves the beaked
end of this Modiola so small as to give it much of the
contour of a Mytillus.
gether

is

The depth

of the two valves to-

greater than the width, and the length

the depth.

The roughness

of the

strias

is

twice

proceeds from

minute elevated scales, that are most conspicuous near
the margin of the shell, and are nearly obliterated to-

wards the beaks.

For this beautiful shell I am indebted to Mr. Goodhall,
who brought it from a pit in Gregory's Land, at Felmarshara, near Bedford.

23

AMMONITES

Sowerbii.

TAB. CCXIII.
a. Sowerbii.

Syn.

Spec.

Char.

Miller

MSS.

Catalogues.

Discoid, carinated, with about eight

spiniform tubercles upon each whorl
fined, entire

Var.

;

elliptical.

four, the inner ones concealed to the

bases of the tubercles

many

;

the outer part of the volutions

gentle undulations

;

the inner part

except that the base of each tubercle
the centre in an obtuse ridge.

rated from the body of the shell

In var.

/3

;

even,

extended towards

The

keel nearly sepa-

it is

round and

entire.

the ridges from the bases of the tubercles are

have a furrovy on each side of

var. a appear to be

rarest specimens

:

it.

The

far

sunk as

inner whorls of

more gibbose than the outer ones.

Mr. Miller considers the

one of his

shell figured as

his collection has also to boast of seve-

ral smaller specimens, belonging to var.
in the gibbosity of the whorls

Dundry,

is

is

more prominent, and the keel sometimes so
to

keel de-

aperture circular^ keel sometimes impressed.

IS

Volutions about

has

aperture

;

;

in the Inferior OoHte.

they were

(3,

which vary

all

found at