IV. SPECIES. CYATHOCRINITES QUINQUANGULARIS. 



FIVE-CORNERED, CUP-LIKE, LILY-SHAPED ANIMAL. 



Specific Character. 



A Crinoidal animal, with a pentagonal column, whose joints adhere by an 

 elevated striated rim, enclosing a pentagonal depression with a similar-shaped 

 central column. The cup-like portion, formed by plates surmounting the column, 

 sending off five arms. 



Locality. 



Clevedon, in the Magnesian variety of the Mountain Limestone; in Moun- 

 tain Limestone, at the Black Rock, near the River Avon. 



Description. 

 A comparatively small species. 



The COLUMN (fig 2. to 8.) is formed of alternating large and small penta- 

 gonal joints, the former being also thicker than the latter, and drawn in near 

 the line of their adhesion to each other. Their centre is perforated by asubpen- 

 tagonal alimentary canal, surrounded by a similar depression, enclosed by a 

 striated rim, which articulates with a similar one on the joint above it. The 

 angles of the alimentary canal do not coincide with those ot the column, but 



