116 FIFTEENTH REPORT ON THE CABINET OF NAT. HISTORY. 



EDRIOCRINUS PYRIFORMIS ( n. s.). / | ■'^<^-*l^ 



General form elongato-pyriform or subclavate. Base elongate, sub- 

 cylindrical, more or less attenuate, solid, or the plates closely 

 ancliylosed. Radial plates more rapidly expanding, giving a sliort 

 turbinate aspect to the upper part of the body, contracting to- 

 wards their superior margins, which are more or less abruptly 

 bent inwards; the upper margins marked by two narrow grooves, 

 for the insertion of the next series of plates. 



Surface smooth or finely granulose-striate. 



The specimens which I have examined are about an inch and a half in 

 length, from the base to the smnmit of the radial plates. One specimen 

 preserves a fragment of a single plate of the third series, but too im- 

 pertect to be of any value in determining the form. The base is usually 

 concave: as if, in the living state, adhering to and clasping some cy- 

 lindrical body. 



Geological formation and locality. In the limestone of the Upper Hel- 

 derberg group. Coll(3cted by E. Jewett and C. A. White, from Eastman's 

 quarry south of Utica. 



GENUS CriEIROCRINUS ( Hall). 



Thirteenth Annual Report of the Regents of the University, on the State Cabinet of 



Natural History. 



CHEIROCRINUS CLA.RUS (n.s.). I j) ' H 



Body of medium size and strength, a little flattened on the dorsal 

 side below, and expanding slightly above. Column short, flexuous : 

 joints in the lower part long, becoming shorter above; basal plate 

 short, concave. First dorsal plate triangular, short, the base a little 

 concave in the centre and straight on each side : dorso-lateral 

 plates five-sided, large, a little thickened at the junction of the 

 arm-plates; upper dorsal or dorso-radial plate short, five-sided, 

 and supporting a single simple arm which is composed of rounded 

 or subcylindrical plates about once and a half as long as wide. 

 The second plate above the dorso-lateral plate is cuneate above, 

 and supports two arms; while the lower plate of the ventral arm 

 is likewise bifurcating, and sustains on its ventral slope a third 

 arm; giving three lateral arms, each of which bifurcate several 

 times, and all are composed of elongate cylindrical joints. [Other 

 arms may exist on the ventral side, but they are not visible in the 

 specimen examined.] 



Surface finely papillose. 



