ee ee . . PAP tome - 
Cm —< Fe a eee es, 
~ ‘ = = A. ~ 
= stim: = bzw “ = SSE Mi AEN Ue I IN = = 
F ‘ ne ES ————— Ce z= ——— — = SSS ESS 
PLATYCRINIDZ. TOD 
the outer ends to the sides of the facets slightly truncated by the first inter- 
radial plate, which is strictly interbrachial, rising only to the top of the first 
distichals. Costals small, as long as wide, trigonal, the sides convex; they 
occupy a third of the radial facets, the other two thirds being occupied by 
, the distichals. Distichals two; the first a little larger than the costals, 
those of the same ray meeting above the latter. Second distichals sub- 
quadrangular, separated from the first by a deep groove; their outer edges 
distinctly excavated at the upper end, forming a well defined, semicircular 
facet for the reception of the arms, which face nearly horizontal. Second 
distichals separated interradially by two very small interbrachial plates. 
Arms two to the ray; their structure and that of the ventral disk unknown. 
Horizon and Locality. — Niagara group; near Greenville, Darke Co., and 
at Cedarville, Greene Co., Ohio. 
Type in the collection of Rev. H. Hertzer of Berea, Ohio. 
ftemarks.— The description and figure were made by Hall from a gutta 
percha impression of a natural mould in the rock. The specimen figured 
on Plate LXXV., Fig. 14, may represent a Marsupiocrinus, but is more 
probably, we think, a Culcocrinus. It was found in the Niagara at Maquo- 
keta, Iowa. 
CORDYLOCRINUS Aner. 
1878. Ancztin; Iconogr. Crinoideorum Suecie, p. 3. 
1879. Zirren; Handb. der Paleontologie, Vol. I., p. 365. 
1881. W. and Sp.; Revision, Part II., p. 60 (Proceed. Acad. Nat. Sci. Phila., p- 234). 
Syn. Platycrinus (m part) — Putiurrs; Murchison’s Siluria, 2d ed., Plate 14, Fig. 9. 
Angelin defines this genus as follows: “ Basalia tria, connata. Radialia 
primaria permaxima, cetera magnitudine multoties superantia; secundaria 
et tertiaria transversa. Interradialia in tribus verticillis. Brachia quin- 
que bidigitata, pinnule longissime.” He places the genus under the 
Platycrinide, and refers to it a single species from Gotland, of which 
he gives a figure. This species has close affinities with the three Amer- 
ican species which Hall (Paleontology New York, Vol. II., pp. 113 to 
116) described as Platycrinus plumosus, P. parvus, and P. ramulosus. 
The latter undoubtedly. are generically identical with a small form from 
the Wenlock group of Dudley, known under the name of Platycrinus 
retiarius Phill., and with two other undescribed species which also occur 
in the neighborhood of Dudley: one with four arms to the ray, the other 
