CONTRIBUTIONS FROM THE RfUSEUM OF PALEONTOLOGY
THE UNIVERSITY OF MICHIGAN
VOL. XIX, NO. 11, pp. 143-155 (2 pls., 2 figs.)
TWO NEW CRINOIDS OF THE
FAMILY PERIECHOCRINITIDAE FROM THE
MIDDLE DEVONIAN THUNDER BAY LIMESTONE
ROBERT V. KESLING
MUSEUM OF PALEONTOLOGY
THE UNIVERSITY OF MICHIGAN
CONTRIBUTIONS FROM THE MUSEUM OF PALEONTOLOGY
Director: LEWIS B. KELLUM
The series of contributions from the Museum of Paleontology is a medium
for the publication of papers based chiefly upon the collections in the Museum.
When the number of pages issued is sufficient to make a volume, a title page and
a table of contents will be sent to libraries on the mailing list, and to individuals
upon request. A list of the separate papers may also be obtained. Correspondence
should be directed to the Museum of Paleontology, The University of Michigan,
Ann Arbor, Michigan.
1. Silicified Trilobites from the Devonian Jeffersonville Limestone at the Falls
of the Ohio, by Erwin C. Stumm. Pages 1-14, with 3 plates.
2. Two Gastropods from the Lower Cretaceous (Albian) of Coahuila, Mexico,
by Lewis B. Kellum and Kenneth E. Appelt. Pages 15-22, with 2 figures.
3. Corals of the Traverse Group of Michigan, Part XII, The Small-celled
Species of Favosites and Emmonsia, by Erwin C. Stumm and John H. Tyler.
Pages 23-36, with 7 plates.
4. Redescription of Syntypes of the Bryozoan Species Rhonzbotrypa quadrata
(Rominger), Roger J. Cuffey and T. G. Perry. Pages 3745, with 2 plates.
5. Rare Crustaceans from the Upper Devonian Chagrin Shale in Northern Ohio,
by Myron T. Sturgeon, William J. Hlavin, and Robert V. Kesling. Pages
47-64, with 5 plates.
6. A Fossil Dennstaedtioid Fern from the Eocene Clarno Formation of Oregon,
by Chester A. Arnold and Lyman H. Daugherty. Pages 65-88, with 7 plates.
7. A New Species of Melocrinites from the Middle Devonian Bell Shale of
Michigan, by Robert V. Kesling. Pages 89-103, with 2 plates.
8. A New Spiraculate Blastoid, Pyra?niblastus, from the Mississippian Hampton
Formation of Iowa, by Donald B. Macurda, Jr. Pages 105-1 14, with 1 plate.
9. A Drastic Reappraisal of "Lepidasterella babcocki Schuchert"-as
ter gyalinzls Clarke, a Streptophiuran Auluroid, by Robert V. Kesling. Pages
115-133, with 4 plates.
10. Decadocrinus hughm'ngi, a New Middle Devonian Crinoid from the Silica
Formation in Northwestern Ohio, by Robert V. Kesling. Pages 135-142, with
11. Two New Crinoids of the Family Periechocrinitidae from the Middle
Devonian Thunder Bay Limestone of Michigan, by Robert V. Kesling.
Pages 143-155, with 2 plates.
VOL. XIX, No. 11, pp. 143-155 (2 pls., 2 figs.)
TWO NEW CRINOIDS OF THE FAMILY PERIECHOCRINITIDAE
FROM THE MIDDLE DEVONIAN THUNDER BAY LIMESTONE
ROBERT V. KESLING
Gennaeocrinus romingeri and Corocrinus pettyesi, two distinctive new
crinoids from the Thunder Bay Limestone exposed at Partridge Point,
near Alpena, Michigan, are named for the men who discovered the holo-
types many years ago. Gennaeocrinus rominge~i is distinguished by its
bowl-shaped dorsal cup, pattern of concentric triangles produced by pro-
nounced costae normal to sutures of the cup plates, few IBrBr, in each
interray, smooth tegminal plates except for one central tubercle, and six
arms in each ray formed on axillary PBr,, SBrBr,, and free TBrBr, on
the inner quarter-rays. Corocrinus pettyesi is characterized by basal flanges
on the BB and by very large RR and X, (anal x ) , nearly twice the size of
PBrBr,, provided with double ridges extending onto BB.
Introduction .............................................................. 143
Locality .................................................................. 144
Systematic descriptions .................................................... 144
Literature cited ........................................................... 153
Plates ............................................................ (after) 153
Barris and Wachsmuth (1886), Wachsmuth and Springer (1897), Wood
(1904), Thomas (1920), Springer (1920; 1921), and others, two new
species have been distinguished. When the holotypes were discovered
many years ago, they were not recognized as new nor described. Both
crinoids belong to the family Periechocrinitidae.
Gennaeocrinus romingeri is named in honor of Dr. Carl Ludwig Ro-
minger, who found the holotype, probably in 1898, the year in which he
LTHOUGH CRINOIDS from the Thunder Bay Limestone of Michigan
have been studied for nearly a century and have been described by
144 ROBERT V. KESLING
made extensive collections from the exposure at Partridge Point. Coro-
crinus pettyesi is named in honor of Mr. Leon 0. Pettyes, of Alpena,
Michigan, who discovered the holotype; the specimen may have been part
of an extensive collection of invertebrates obtained from him in 1926.
One additional specimen of Gennaeocrinus romingeri and two of Corocrinus
pettyesi were collected by Mr. Irving G. Reimann in 1945, at which time
he was employed by the Buffalo Society of Natural Sciences and presented
the specimens to the Museum of the Society.
All specimens are fairly well preserved, although the distal parts of the
arms are missing. As deposited in the Museum of Paleontology and the
Buffalo Museum of Natural Sciences, they were partly obscured by weath-
ered matrix. This was removed by careful cleaning with small needles and
Professor Chester A. Arnold and Professor Lewis B. Kellum critically
read the manuscript. Mrs. Helen Mysyk typed the final draft, and Mr.
Karoly Kutasi assisted in photography. My sincere thanks to each for
help in preparing this paper.
Holotypes of both species are deposited and catalogued in the Museum
of Paleontology of The University of Michigan.
All specimens described here are from the same locality.
Bluffs on the northeast side of Partridge Point, a peninsula between Lake Huron and
Squaw Bay, about 4 miles south of Alpena, Michigan, extending from the center
of sec. 11 into its SEg, T. 30N., R. 8E. Type locality of the Thunder Bay
Wachsmuth and Springer 1885
Order MONOBATHRIDA Moore and Laudon 1943
Suborder Tanaocrinina Moore 1952
Superfamily Periechocriniticae Ubaghs 1953
Family Periechocrinitidae Austin and Austin 1843
Genus Gennaeocrinus Wachsmuth and Springer 188 1
kentuckiensis Shumard (1866, p. 345).
original designation ( 188 1, p. 16 1 ), Actinocrinus
Gennaeocrinus romingeri, sp. nov.
(Pl. I, Figs. 1-8)
flat base reminiscent of Megistocrinus, composed of 3 BB, 5 RR, 5 PBrBr,,
bowl-shaped rather than cup-shaped, with a rather
THUNDER BAY CRINOIDS 145
5 PBrBr,, 10 SBrBr,, X, (anal x ) , 3 XX,, 5 XX,, 5 XX,, about 5 XX,,
4 IBrBr,, 8 or 9 IBrBrZ, 12 or 13 IBrBr,, 8 or 9 IBrBr,, and several
ISBrBr and ITBrBr (Fig. 1).
BB forming large regular hexagon, about two-fifths the diameter of
entire cup (PI. I, Figs. 1, 8). Each of the three BB pentagonal, bounded
distally by three RR or by two RR and X, and laterally by two other BB,
ornamented with seven or eight regularly spaced sharp costae normal to
its distal side and three or four normal to each of its distolateral sides
(Fig. 1). Proximal angle of PB modified by a relatively small facet for
articulation with column; margin around facet slightly elevated and
FIG. 1. Gennaeocrinus romingeri, sp. nov. Labeled plate diagram, with pattern of
ornamentation indicated on some rays and interrays.