Mr. Say on Crinoidea. 311 



Art. XXXV. On two Genera and several Species of 

 Crinoidea. By Thomas Say, EsqJ* 



I AM indebted to the politeness and liberality of Dr. J. Bigsby, 

 for the opportunity of describing the very interesting Animal Re- 

 mains Which form the subject of the following new Genus. 



Family Crinoidea. 

 Genus Caryocrinites, 

 Generic Character. Column cylindrical, perforated by a tubu- 

 lar alimentary canal : pelvis formed of four plates ; costal six, 

 supporting the scapulae^ from which the arms proceed. 



In Miller's arrangement this genus will occupy a station in the 

 division Inarticulata, between the genera Cyathocrinites and 

 Actinocrinites. It may be indicated by the following formulae. 



A. Pelvis of four plates. 



A. Costal plates six. 



a. Column not dilated. 



0. Alimentary canal round. 



§. Articulating surface of the columnar joints radiated. 

 t. Auxiliary side arms cylindrical and placed irregularly, Genus 

 Caryocrinites. 



1. Two of the costals hexagonal; 1" species C. ornatus, tab. nost. 



f. 1. 



2. One of the costals hexagonal ; 2"'' species C. loricatus. 



Species, 



] . C. ornatus, Costals, four pentagonal and two hexagonal. 



Column inserted into a cavity at the base of the pelvis : pelvis 

 rather large ; two of the plates quadrangular, attenuated to the 

 base, where they are truncated and a little recurved at the junc- 

 tion with the column ; disks, particularly towards the base, gran- 

 ulated, with a distinct elevated interrupted line ; two remaining 

 plates pentangular, attenuated to the base, where they are trun- 

 cated and a little recurved at the junction with the column ; disk 



* From the Journal of the Academy of Natural Sciences of Philadelphia, 

 Vol. IV. No. 9. 



