Bulletins of American paleontology (Bull. Am. paleontol.) Vol 233236

«

f-

BULLETINS
OF

AMERICAN
PALENOTOLOGY

VOL.

LII

1967

Paleontological Researcli Institution
Ithaca,

New York
U.

S.

A.

14850


CO MP. ZOOL.
"ZRARY

HARVARD
UNIVERSITY
IN

MEMORIAM

William H. Cole
(1892-1967)


CONTENTS OF VOLUME

LII

Plates

233.

Data on New
cyclina (Foraminifera)

Additional

By

234.

W. Stom

Zealand

Cole

1-18

3-16

19-110

33-43

209-394

Late Tertiary Biostratigraphy (Planktonic
Foraminifera) of Tropical Indo-Pacific
Deep-Sea Cores
By Frances

236.

1-2

Stromatoporoidea of Missouri
By Paul K. Birkhead

235.

Pages

Astero-

L.

Parker

Foraminifsral Bicfacies Variation and the
Miocene-Pliocene Boundary in Southern
California

By James

C. Ingle, Jr


INDEX
No

separate index

indexed separately.
volume.

is

included

for

Contents of volume

the volume.
is

listed in the

Each number

is

beginning of the


^

i

-

P
-rtii 1

BULLETINS
OF

AMERICAN
PALEONTOLOGY
Vol.

No.

52

233

ADDITIONAL DATA ON NEW ZEALAND
ASTEROCYCLINA (FORAMINIFERA)
By

W. StorrsCole

'^
'

1967

Paleontological Research Institution
Ithaca,

New

York, 14850, U.S.A.

5

19$7

--^^Tr

PALEONTOLOGICAL RESEARCH INSTITUTION
1966-1967

Donald W. Fisher
Kenneth E. Caster

President
Vice-President

Rebecca

Secretary-Treasurer

Katherine V.

Director

Harris

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Counsel
Representative

S.

W. Palmer

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Trustees

Katherine V. W. Palmer (Life)
William B. Heroy (1963-1968)
Axel A. Olsson (Life)
Rebecca S. Harris (Life)
Hans G. Kugler (1963-1969)
Daniel B. Sass (1965-1971)
W. Storrs Cole (1964-1970)

Kenneth E. Caster (1966-1972)
Donald W. Fisher (1961-1967)

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BULLETINS

OF
AMERICAN PALEONTOLOGY
(Founded 18S5)

Vol.

No.

52

233

ADDITIONAL DATA ON NEW ZEALAND
ASTEROCYCLINA (FORAMINIFERA)

W.

Storrs Cole

Cornell University

February 15, 1967

Paleontological Research Institution
Ithaca,

New

Yorlc, U.S.A.


Library of Congress Catalog Card

Number: GS 67-130

MUS. COMP. ZOOL.
LIBRARY

MAR

1

5 1967

UNIVERSITY

Printed in the United States of America


CONTENTS

Page

Abstract

5

Introduction

5

Localities

6

Discussion and description of species

6

Asterocydina hornibrooki,
Asterocyclina speighti

n.

sp

(Chapman)

6
10

Literature cited

12

Plates

13



ADDITIONAL DATA ON NEW ZEALAND
ASTEROCYCLINA (FORAMINIFERA) *
W.

Storrs Cole

Cornell University
Ithaca,

New York

ABSTRACT
Abundant specimens of the foraminiferal genus Asterocyclina from a new
locality in the Totara Limestone (upper Eocene) of New Zeahind are compared
with similar specimens previously assigned questionably (Cole, 1962, pp. 350, 351)
to Asterocyclina matanzensis Cole (1957 a, p. 350) and A. prctecipua Cole (1957 b,
The specimens identified as A. matanzensis are the megalospheric form
p. 780).
and those referred to A. praecipua are the microspheric form of a new species,
designated A. homibrooki.
Specimens from another new locality in New Zealand, identified as Asterocyclina
speighti

(Chapman),

are discussed and illustrated.

INTRODUCTION
1962 Dr. N. de B. Hornibrook, senior micropaleontologist of the

In

New

Zealand Geological Survey, requested

of Asterocyclina from the Eocene of
possible to obtain

a

sufficient

me

New

number of

to study several collections

Although

Zealand.

thin

satisfactory

redescribe and illustrate (Cole, 1962) Asterocyclina speighti
(19.^2, p.

it

was

sections

to

(Chapman)

485), adequate preparations of Asterocyclina from the Totara

Limestone (upper Eocene) could not be made

were available (Cole, 1962,

p.

as

only a few specimens

350).

However, from the fragmentary data obtained the specimens from
the Totara Limestone were referred questionably to two species, A. mat-

anzensis Cole and A. praecipiia Cole.

A. matanzensis was described from

the upper Eocene of Saipan Island (Cole, 1957^),
cores

from the Eniwetok Atoll

drill

and A. praeciptia from

holes (Cole, 1957 b)

Recently Hornibrook forwarded two additional collections (Iocs. 1,3),

one

(loc.

1)

of which contained

and the other

speighti,

(loc. 3)

abundant specimens of Asterocyclina

had numerous specimens which proved

to

be identical with specimens previously identified as A. matanzensis and A.

Hornibrook

praecipna.

(letter

dated July

7,

1966)

wrote concerning

Runangan Stage (upper Eocene) in the range zone
of Glohigerapsis index and should be the same age as the previous specimens I sent you from the Totara Limestone at Fortification Hill about five
locality 3

"The age

is

miles away."
In the same letter he included the following statement concerning
locality

1

"The Waihao Greensand contains Bortonian (middle Eocene)

Foraminifera elsewhere in the area and
*

The

is

underlain by sands and thin coal

cost of the printed plates has been contributed by the

Geological Sciences Department of Cornell University.

Gurley Fund of the

Bulletin 233

measures which
lenses with

silt

turn rest on basement.

in

The age of

the Greensand.

middle Eocene or older

Many

Locally,

lenses containing larger Foraminifera

the large forams

made from

The major

was encountered

likely,

therefore,

to

be

the specimens are illustrated

both by transmitted and reflected light so that
sented clearly.

conglomerate

Lower Eocene)."

(I suspect

of the thin sections

is

thin

and oysters underlie

difficulty in the

in obtaining satisfactory

all

the details will be pre-

preparation of the thin sections

exposure of the embryonic and

periembryonic chambers as these chambers generally disintegrated as the

was made.

section

The specimens which
of the

New

Loc.

— South Branch

are illustrated will be deposited in the collection

Zealand Geological Survey.

LOCALITIES
1

Waihao

River, right bank, one-half mile upstream

from the bridge; grid reference

New

Zealand Geological

S.

127-448090,

Survey collection

map

edition 1943;

127-740; P. A.

S.

Maxwell, collector.*
Loc.

—

2

Fortification

Hill,

Hornibrook, 1961,
Loc.

—Old quarry

3

Oamaru

;

Limestone

Totara

169; Cole, 1962,

p.

p.

prominent east-facing escarpment three-quarters of a

in

mile east of Clarke's flour mill, Maheno,

Limestone;
Loc. 4

—

New

1957

b)

pi.

a,

,

Oamaru

;

top of Totara

Zealand Geological Survey collection S 136-1065.

Station S 259, Saipan,

(Tertiary

(references:

345).

Mariana Islands; Densinyama Formation

limestone-conglomerate

facies

(reference.

Cole,

4).

DISCUSSION

AND DESCRIPTION OF SPECIES

Asterocyclina hornibrooki Cole,

n.sp.Pl.

1, figs.

1-12, 16; PI. 2, figs. 1,5,6,8,10

Asterocyclina matanzensis Cole, Bull. Amer. Paleont., vol. 44, No. 203,
pp. 350, 351, pi. 68, fig. 8, not Asterocyclina matazensis Cole, 1957 a.
1962. Asterocyclina praecipua Cole, Bull. Amer. Paleont., vol. 44, No. 203, p.
350, pi. 68, fig. 9, not Asterocyclina praecipua Cole, 1957 b.
1962.

Specimens of Fortification Hill
p. 350,

351)

The
fig.

*

test

is

which are

rays

(loc. 2)

were described (Cole, 1962,

as follows:

mm. There are 4 to 6
l] in some specimens and indistinct [PI. 1,
more prominent in the peripheral zone and

small with diameters from 0.9 to 1.9
distinct [PI.

2] in others.

These

1,

fig.

rays are

W.

Riddolls, M.Sc. candidate at the University of Canterbury, discovered this
and has an article in press in the
Zealand Journal of Geology and
Geophysics describing it in detail.
B.

locality

New


New Zealand

Astewcydina: Cole

fade into the central area.
Many specimens have a slightly projecting central
papilla [PI. 1, figs. 1,8} with a diameter of about 100 /i. Smaller, less distinct
papillae occur on the other parts of the test.
The thickness of the test at the
center is from 0.5 to 0.6 mm.

The embryonic chambers are large, the initial chamber has diameters of
110 by 130 M, and the second chamber has diameters of 30 by 170 [i. The distance across both chambers is about 160 /i.
The embryonic chambers are
surrounded by a single ring of periembryonic chambers [PI. 2, figs. 6,8}.
The equatorial chambers are small with radial diameters of about 30/i and
tangential diameters of about 20 /x.
The lateral chambers are arranged in regular tiers [PI. 1, fig. 6} with about
8 chambers at the center on each side of the equatorial layer.
The chambers
have a length of 40 to 80 /U, a height of 10 yu, and the roofs and floors have a
thickness of 10 ti. Some sections have a strong central pillar [PI. 1, fig. 11}
with a surface diameter of about 100 (i. Much smaller pillars occur irregularly
on the

The

rest of the vertical section.

description of the specimens

from

Fortification Hill

supplemented by the study of the more abundant material from

The specimens

mm)

3.2

(loc.

2)

is

locality 3.

3) are in general larger (diameter from 2.1 to

(loc.

and thicker (0.77

to 0.93

mm),

otherwise they have the same

external appearance.

Measurements of two equatorial

sections,

one from

and the

locality 2

other from locality 3 follow:
Table

1.

—Measurements

of Equatorial Sections of AsterocycUna hornibrooki

Locality

2

Specimen
Diameter
Embryonic chambers:
Initial chamber
Second chamber

PI. 2, fig.

mm

Distance across
both chambers
Thickness of
outer wall
Equatorial chambers:
Radial diameter
Tangential diameter

The

initial

embryonic chamber
ber (PI.

1,

fig.

PI. 1, fig. 12

2.1

(i

110 x 130

150 x 175

/i

40x175

50x180

160

\i

{i

15

/t

40
20-30

ju

embryonic

3

6

1.45

chamber

is

nearly

210
20

40-60
20-30

The second

circular.

reniform and only slightly embraces the

is

The periembryonic chambers form

12).

a

initial

cham-

complete ring

around the embryonic chambers.

Measurements of
tion

Hill,

Table

(loc.

2)

five

of two specimens from Fortifica-

specimens from locality 3 are given in

2.

Although the
tiers,

vertical sections

and of

there

is

lateral

chambers are arranged more or

some overlap from

tier to tier (PI. 2, fig. 5).

less in

The

regular

equatorial

chambers, especially along a ray near the periphery, become double (PI.

fig.

3,

right side).

Many

specimens have a strong central pillar

(PI.

1,

1,


Bulletin 233

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u^ 00

"^•^

oc

oc

CO

c c

OC

CO

u-^C

CC

<^

C

C

v:

o

o^

co2E

=i.

=i.

I

u.

«

•=:

QHw

r-j-i—'4^-1-. C

(L)

_4_,

rt

6C t>C~

p

tiO 6fj

w

kJ

60 ao

CC

'^

3. 3.


New Zealand

7), but others do not (PI.

figs. 5,

Type sptchuen.

TF

catalogue No.

Discussion.
(loc.

— Figure

2, figs. 4,

Cole

9).

Plate 1: Nevv' Zealand Geological Survey

1,

1555/1.

—The

megalospheric specimens

questionably assigned

2)

AsterocycHna:

nmtanzensis Cole (1957^?,

(Cole,

1962,

350) represent

p.

a

from

new

Hill

Fortification

351)

p.

to

Asterocyclina

species, designated

honiibrooki, in honor of Dr. N. de B. Hornibrook for his excellent

New

search on

A,
re-

Zealand micropaleonto'ogical problems.

Cole (1962,

351) wrote "These specimens most nearly resemble

p.

name

those described from Saipan Is'and under the
ensis (Cole,

1957

(Cole, 1957

h,

a,

p.

350) and

p.

found

AsteyocycHiui niaianz-

Eniwetok

in the

more spccim.ens can be

Until

777).

later

drill

holes

studied, they are

assigned to this species.

"However, there
and the
lateral

New

are differences bctv/cen the types of

chambers to

with those of the

a tier,

New

Two

to

(PI.

New

1,

fig.

and

numerous,

Zealand specimens

the

are

nearest that of speci-

(PI. 2, fig. 7), the other

The

aligned in extremely regular

cavities

horuihyooki tend to overlap, are
are

is

any other species."

to

comparison with A. hornihrooki.

chamber

variance

by

of a vertical section of a topotype of A.

17)

nnitauzeus'is

number of
at

But, the resemblance in shape

one by transmitted light

watairzensis, are given for

chambers of A.

and some of the measurements are

A. Duitaiizensis than

illustrations,

light

A. niatanzensis

types have double the

Zealand specimens.

and configuration of the

mens assigned
reflected

The

Zea'and specimens.

low,

are

whereas

are

of

A.

those

numerous, and the chamber

less

lateral

tiers,

cavities

more open.
Satisfactory preparations of the

embryonic chambers of the types of

A. niatanzensis were not obtained as the embryonic apparatus had been

destroyed

Eniwetok

Later specimens

by replacement.
drill

holes (Cole, 1957 b,

question A. niatanzensis.

pi.

249,

In preparations

all

were

recovered

figures)

made from

from

the

which are without

these specimens the

embryonic chambers were preserved.

The embryonic chambers
embryonic chamber

chambers

is

is

better developed.

paring figure

6,

of A. hornibvooki are larger, the second

distinctly reniform,

and the ring of periembryonic

These differences can be observed by com-

Plate 2 with figures 4, 10, 16, plate

249 (Cole, 1957 b)

A. niatanzensis and A. hornibvooki have a general resemblance to
Asterocyclina stellata (d'Archiac)

(Neumann, 1958,

pi. 30, figs. 1-7)

from


Bulletin 233

10

However, the arrangement and shape

Bartonian and Lutetian of France.

of the lateral chambers are different in

Specimens
1962, p. 350,

prove

to

(PI. 1, hg.
pi.

68,

assigned questionably

Cole

9) are

fig.

(1957

b,

p.

rare,

Alihough

be microspheric.

(Cole,

1962,

they

780),

these species.

all

16) with a few, large, raised papillae (Cole,

and

this

in every case

350)

p.

upon sectioning

kind of specimen previously was
to

AsterocycUna praecipna

represent the microspheric

form of A.

horn'ihrooki.
PI. 1, figs. 13-15;
Asterocyclina speighti (Chapman)
AsU'wcyditni speighti (Chapman), Cole, Bull. Amer.
iy62.

203, pp. 346-350, pi. 67,

Topotypes

mm.)
Many

(Cole,

figs.

1962)

1-10;

pi.

9-11

No.

are slightly larger

than the specimens from locality

(average diameter 3.2

(average diameter 2.7

1

of the topotypes are distinctly rayed (Cole, 1962, pi. 67,

whereas most of the specimens from
fig.

68, figs. 1-7

PI. 2, figs. 2-4,

Paleont., v. 44,
(references).

locality

15) or umbonate with a rim (PI.

1

fig.

1,

mm.).

figs. 4,

5),

are either biconvex (PI.

1,

14) similar to the topotype

illustrated as figure 6, pl.

68 (Cole, 1962).

specimens from locality

resemble Discocyclina, and only a few specimens

from

this locality

The

1-3, Cole,

Externally the majority of the

could be assigned to Asterocyclina by external appearance.

equatorial chambers, however,

(PI. 2, figs. 9,
figs.

1

are arranged in a rayed pattern

11) similar to that of topotypes (pl. 67,

1962), and the embryonic

%s.

9,

10;

and periembryonic chambers are identical with those of topotypes.
distinctive

embryonic apparatus

is

pi. 68,

(Pl. 2, figs. 9, 11; text-fig.

one of the best

specific

1)

The

characters of

A. Speight!.

Figure

X

74, of the

—

Embryonic apparatus and the initial annulus of equatorial chambers,
specimen illustrated as figure II, Plate 2.

1.

New Zealand

Cole

Asterocyclina:

11

A

vertical

illustrated.

These

Several microspheric specimens were found at locality
section

(PL

13) of one of these specimens

fig.

1,

mm,

specimens have a diameter from 3.0 to 4.4

are

similar

the nonrayed

to

1.

but otherwise externally

The

equatorial

the equatorial

chambers

megalospheric specimens.

specimens have

the microspheric

of

sections

is

arranged in rays although in one individual the rayed arrangement of the
equatorial chambers
Disa/ssio)i.

was not too pronounced.

— Hornibrook

in the vicinity of the

obtained

Later,

27 and Table 1) placed the beds

p.

Mangaorapan Stage of

the

in

Eocene).

(1958,

Eyre River from which the types of A. speighti were

he wrote (Cole, 1962,

p.

the Dannevirke

(lower

Series

349) 'Tinlay assigned the Eyre

bed to the Mangaorapan

stage, but the presence of a species of Pser/dohas-

tigerhia rather suggests

Heretaungan stage."

graphically above the

Mangaorapan Stage

is

This stage although
still

strati-

assigned to the lower

Eocene.

Specimens identified (Cole, 1962,

Chatham

p.

351)

A. spe/ghti from the

as

Islands occurred in limestones dated

"as 'mid to

Eocene' on the presence of Globigerapsis index (Finlay)."
stone from the

Chatham

Islands (Cole, 1962, p. 352)

upper

Another limewhich contained

specimens of A. speighti was dated as Paleocene by smaller Foraminifera.

The Waihao Greensand which
speighti at locality

(Llornibrook,

1

letter

is

the

overlies

lenses

containing A.

assigned to the Bortonian Stage (middle Eocene)

dated July

7,

1966).

However, the lenses with

Asterocyclina seemingly do not contain smaller Foraminifera.

Therefore,

these lenses could be Bortonian or a stratigraphically older stage.

Data available suggest that A. speighti could range from the Mangaorapan Stage (lower Eocene) into the Bortonian.
tion of A. speighti with

three localities in the

"mid

Chatham

to

However, the

smaller Foraminifera above the lenses with A. speighti at locality

As

the specimens on which

were presumed to be

at

Islands and the occurrence of Bortonian

Branch Waihao River) suggest that A. speighti

speighti

associa-

upper Eocene" smaller Foraminifera

is

a

1

(South

middle Eocene

species.

Chapman (1932)

lost

based Asterocyclina

(Cole, 1962, p. 342), the topotype

(New Zealand Geological Survey
5, Cole, 1962)
1461/1) was designated the neotype. Recently, Mr.
D. R. Gregg, Keeper of Geology, Canterbury Museum, discovered and
specimen

(pi.

67,

catalogue No.

TF

sent to Dr.

fig.

Hornibrook two thin sections which

of the material studied by

Chapman.

are without question part

Bulletin 233

12

Dr. Hornibrook (letter dated 17 October 1966) was able to recognize
the following specimens illustrated by

The

Chapman

(1932,

contained the specimens shown on plate 51, figure

on

pis. 51,

52)

:

thin section labelled "15, Tuff, Eyre R., D. dispaiisa, photo"

plate 52, figure

h.

6ci,

The

thin section

Tuff, Eyre R., Asteyocycliiia stellata"
51, figure 4z, b,

la, b, c; figure 2;

—

and

on which was written "015,

had the specimens

illustrated

on plate

c.

The specimens

illustrated by figures 3, 5, plate 51 could not be recog-

nized.

Hornibrook wrote

Chapman

that

in

this letter

(17 October 1966)

the vertical sections which

called

"It

obvious

is

missed the proloculus,

and called the ones through the proloculus by other names",

spe/ghti,

and he suggested

".

.

.

that the

specimen on slide 015 would be the best

selection for lectotype because of the well preserved specimens next to

showing good proloculi."

This recommendation

The illustration (Chapman, 1932, pi. 51,
mens designated in the explanation of plate

b

is

fig.

51

are AsterocyclDia speighti

(Chapman)

4) shows three speci(a)

as

publication or on the thin sections a type.

Asterocyclina

All these speci-

of which the specimen labelled

Chapman

the lectotype by designation here as

it

accepted.

(b) D/scocycl/na speighti, and (c) D. dispcvisa.

stellata,

mens

is

did not indicate in his

This selection supercedes the

designation of the neotype (Cole, 1962).

LITERATURE CITED
Chapman,

F.

1932.

On

land), vol.

Cole,

W.

and Assilina, found near Mt. OxRecords Canterbury Mus. (New Zea-

a rock containing Discocyclina

South Island,

ford,

3,

New

Zealand.

pp. 483-489, pis. 61, 62.

S.

Larger Foraminifera {of Saipan Island). U.
Paper 280-1, pp. 321-360, pis. 2, 4, 94-118, 4 tables,

1957rf.

S.
1

Geol.

1962.

Asterocyclina from

Amer.

Paleont., vol. 44,

New

Sur.,

Prof.

chart.

Larger Foraminifera from Eniwetok Atoll drill holes.
Sur., Prof. Paper 260-V, pp. 743-784, pis. 230-249, 6 tables.

1957^.

U.

S.

Zealand and the Chatham Islands.
No. 203, pp. 343-357, pis. 67, 68.

Geol.

Bull.


New Zealand

Hornibrook, N. de
1958.

Asterocycliua:

Cole

13

B.

Netv Zealand Upper Cretaceous and Tertiary

some overseas

correlations.

Micropaleont., vol.

4,

jora?niniferal zones

No.

1,

pp. 25-38,

1

and
pi.,

2 tables.

196L

Tertiary Forafninifera from

f/iatics

and distribution.

192 pp., 28

pis.,

New

7 tables, 5

Oamaru

District

Zealand Geol.

Sur.,

(N.Z.).

Part I. SystePaleont. Bull. 34 (l),

figs.

Neumann, M.
1958.

Revision des Orbitoidides du Cretace et de I'Eocene en Aquilaine ocSoc. Geo!. France, Mem. 83 (n. ser), 174 pp., 36 pis., 54

cidentale.
text-figs.



PLATES


Bulletin 233

16

Explanation of Plate

All figures,

X

20, except

1,2,8,

X

15;

1

all

figures by reflected light

except 9,10.

Page

Figure

1,12,16.

6

Asterocyclina hornibrooki Cole,n. sp
1,2,8.

External views to

illustrate

the variable

de-

velopment of the rays.
2,8. Specimens with

1. Holotype.
a pronounced central papilla.
3-7,9-11.

Vertical sections of megalospheric specimens.
The same specimen, also illustrated as
6. The same specimen as
5, Plate 2.
figure 1, Plate 2.

4,10.
figure

12.

Equatorial

section

of

a

megalospheric speci-

men.
16.

13-15.

section of a microspheric specimen
similar to the one previously identified (Cole,
1962, pi. 68, lis;. 9) as Asterocyclina praecipiia
Cole.

Vertical

Asterocyclina speighti (Chapman)
13.

14,15.

Vertical

10
of a microspheric specimen.

Vertical sections of megalospheric specimens.
14.
15.
14.

17.

section

The same specimen as figure 4, Plate 2.
The same specimen as figure 2, Plate 2.
With a rim; 15. Biconvex without a rim.

Asterocyclina mataniensis Cole
Vertical section of a megalospheric specimen,

topotype, introduced for comparison with
Asterocyclitia hornihrooki Cole, n. sp.; illustrated also as figure 7, Plate 2.

—

1,2,6,8,11.

Loc.

2

3-5,7,9,10,12,16.

Loc.

3.

Loc.

1.

13-15.
17.

Loc. 4.

see

text

for

locality descriptions.


Bull. Amer. Paleont., Vol. 52

Plate

1


Bull. Amer. Paleont., Vol. 52

Plate

2

.V


New Zealand

Asterocyclina

Explanation of Plate

Figures

1,

5-10,

X

40; 2-4,

X

:

Cole

17

2

20; 1-6 by transmitted light; 7-11 by

reflected light.

Page

Figure

1,5,6,8,10.

Asterocyclina hornibrooki Cole,
1,5.

specimen
6,8,10.

2-4,9,11.

n.

sp

6

Vertical sections of megalospheric specimens.
1. The
same specimen as figure 6, Plate 1. 5. The same
as figures 4,10, Plate 1.

Equatorial sections of megalospheric specimens to
illustrate the embryonic, periembryonic, and equatorial
chambers.

Asterocyclina speighti (Chapman)
2-4.

9,11.

10

Vertical sections of megalospheric specimens.
2.
same specimen as figure 15, Plate 1. 4. The
specimen as figure 14, Plate 1.

The
same

Parts of equatorial sections of megalospheric specito illustrate the embryonic, periembryonic, and
equatorial chambers.
11. Details of the embryonic

mens

apparatus

7.

shown

as text-figure

1.

Asterocyclina matanzensis Cole
Part of a vertical section of a topotype introduced
for comparison with Asterocyclina hornibrooki Cole,
n. sp.; also illustrated as figure 17, Plate 1.

1,6,8.

Loc. 2

—

2-4,9,11.

Loc.

1.

5,10.

Loc.

3.

7.

Loc. 4.

see text for locality descriptions.

9