Apiocrinites. RADIATA. CRINOID^E. i93 



CRINOIDiE. 



I. Plates of the body, or pelvis, resting on the last columnar joint, and 

 forming the cup containing the viscera articulated with each other by 

 lip-like and transverse processes, having a minute perforation. 



Apiocrinites. 



Pentacrinus. 



(Encrinites.) 



II. Plates of the body articulating imperfectly with eacli other by transverse 

 processes, having a minute central perforation. 

 Poteriocrinites. 



III. Plates of the body adhering by sutures lined by muscular integument. 



Cyathocrinites. 



{Caryocrinites. Zool. Journ. ii. 311.) 



Actinocrinites. 



Rhodocrinites. 



Platycrinites. 



IV. Plates of the body anchylosing with the last columnar joint. 



(Eugeniacrinites.) 



Gen. APIOCRINITES.— Pelvis of five plates, supporting five 

 costal plates ; fingers formed of a single series of joints. 



1. A. rotundus — Column round, central ; canal round ; articulating surfaces 

 of the columnar joints radiated — Pear Encrinite of Bradford, Park. Org. Rem. 

 ii. 208. t. xvi. f. 1 A. rot. Mill. Crin. 18.— In Oolite. 



2. A. ellipticus Column elliptic ; central canal round ; articulating surfaces 



of the columnar joints transversely ridged ; auxiliary side-arms on the column. 

 Bottle Encrinite, Straight Encrinite, and Stag Horn Encrinite, Park. Org. 

 Rem. ii. 231. t. xiii. f. 31, 34, 75 — A. ell. Mill. Crin. 33 — In Chalk. 



Gen. XV. PENTACRINUS.— Pelvis of five plates, support- 

 ing five costals ; column not enlarging at the summit ; fin- 

 gers formed of a single series of joints ; column pentago- 

 nal ; the articulating surfaces of the columnar joints petal- 

 shaped. 



40. P. etiropocus. — Arms ten, nearly simple, axillary side 

 arms five at the summit of the body. 



Memoir on the Pentacrinus europneus, a recent species discovered in 

 the Cove of Cork, with two illustrative plates, 1st July 1823, by J. 

 V. Thompson, Esq. F. L. S. 

 This valuable addition to the British Fauna was found attached to the 

 stems of various species of Sertulariadae and Flustrada?, growing in from 

 eight to ten fathoms water. Height about three-fourths of an inch, and in- 

 vested with a delicate, continuous, gelatinous cuticle. The base of the co- 

 lumn is expanded into a convex calcareous plate, by which it is attached to 



