356 



NOTES 



On Foreign Jurassic species of the genus ECHINOBRISSUS nearly allied to 

 British forms, but which have not yet been found in the English Oolites. 



A. — Species in which the anal valley extends to the apical disc. 



Echinobrissus elongatus, Agass. Syn. Echinobrissus elongatus, Cotteau and Triger, 



Echinides de la Sarthe, pi. x, figs. 8 — 1 1 . 



A narrow, oblong, elongated nucleolite, thin at the border, convex before, truncated, 

 thin, and recurved behind ; apical disc central ; anal valley wide and reaching the disc ; 

 ambulacra narrow ; zones slightly petaloidal ; base concave ; mouth excentral, small, and 

 situated in a depression. 



Dimensions. — Height, half an inch ; length, one inch and one tenth of an inch ; 

 breadth, seven tenths of an inch. 



Formation. — Calcaire a polypiers (Bathonien) Normandy. Forest marble (Sarthe). 



Collections. — M. Deslongchamps. My cabinet ; the specimens sent by Professor 

 Deslongchamps. 



Echinobrissus crepidula, Desor. Syn. Nucleolites crepidula, Cotteau, Echinides Fossiles, 



pi. V, figs. 4 — 6, p. 68. 



A small elongated urchin, very flat, rounded, and narrow anteriorly, dilated and sub- 

 rostrated posteriorly ; anal valley elongated, deep, and broad, extending from the disc to 

 the border ; mouth pentagonal and sub-medial. 



Dimensions. — Height, five inilhmetres and a half; length, fourteen millimetres ; 

 breadth, eleven millimetres. 



Formation. — Forest marble of Chatel-censoir (Yonne), where it is abundant only as 

 siliceous moulds of the interior. 



Collections. — M. Cotteau. Museum of Paris. 



