APrine +. 
Art. [X.—On a new Crinoid from the Cretaceous formation of 
the West; by GkorGE Brrp GRINNELL. With Plate IV. 
AMONG the many interesting fossils recently received from 
the West by the Yale College Museum, is a new Crinoid from 
the Cretaceous of the Uinta Mountains and of Kansas. No 
crinoids from the American Cretaceous have hitherto been 
described, and for the discovery of this species we are indebted 
to Prof. O. C. Marsh, who has done so much to bring to light 
the geological treasures of the West. 
The Crinoid in question belongs to the group Astylide, or 
free Crinoids, and, as suggested by Prof. Marsh in his earliest 
paper on the Geology of the Uinta Mountains,* is allied 
to the genus Marsupites of Miller. From that genus, however, 
it differs widely in the number and arrangement of its plates, in 
aving apparently ten arms, and in other characters; and it is 
possible that an examination of additional material may show 
it to be the type of an entirely new group. This point, how- 
ever, cannot at present be determined. 
Vintacrinus socialis, gen. et sp. NOV. 
body as seen is somewhat discoidal in form, owing to 
pressure, but in life was evidently subglobose. The basal and 
subradial plates are imperfectly known. In the most perfect 
without inward, their shape being sub-elliptical. The arms give 
Support to delicate pinnuls, or tentacles, for a portion of their 
* This Journal, vol. i, p. 191, March, 1871. 
