347 Bulletin 5 77 



CRINOIDEA. 289 



On hvo genera and several species of Crinoidea. 

 By Thomas Say. Read March \st, 1835. 



I am indebted to the politeness and liberality 

 of Dr. J. Bigsbjs for the opportunity of describing 

 the very interesting animal remains which form 

 the subject of the following new genus. 



Family CRINOIDEA. 

 Caryocrinites. 



Generic character. Column cylindrical, perforat- 

 ed by a tubular alimentary canal : pelvis formed of 

 four plates ; costals six, supporting the scapulae, 

 from which the arms proceed. 



In Miller's arrangement this genus will occupy 

 a station in the division hiarticulata , between the 

 genera Cyathocrinites & Actinocrinites. It may 

 be indicated by the following formula. 



A. Pelvis of foiir plates. 

 A. Costal plates six. 

 a. Cokimn not dilated. 



0. Alimentary canal round. 



1. Articulating surface of the columnar joints, radiated. 

 f. Auxiliary side arms cylindrical, and placed irregular- 

 ly. Genus Caryocrinites. 



1. Two of ttie costals hexagonal. \st Sp. ornatus. 



2. One of the costals hexagonal, -id Sp. loricatus. 

 VOL. IV. — MARCH, 1825. 37 



[J. A. N. S., Phila., ist Ser., Vol. IV, 1825.] 



