FOREIGN JURASSIC ECHINOBRISSI. 359 



from the simiinit, and forming a sulcus in the posterior border ; mouth-opening small and 

 excentral. 



Dimensions. — Pleight, eleven twentieths of an inch ; length, one inch and one 

 twentieth ; breadth, nine tenths of an inch. 



Formation. — Kellovvay ferrugineux, near Mamers, Sarthe ; very rare. 



Collections. — MM. Michelin and Cotteau ; my cabinet. 



EcHiNOBRissus IcAUNENSis, Cotteciu. Echiuides Foss. de I'Yonne, pi. xlv, figs. 6 — 8, 



p. 326. 



Test elongated, depressed, narrow before, wider behind ; apical disc excentral, nearer 

 the anterior border ; anal valley short, wide, extending only half way between the border 

 and disc ; vent large and elliptical ; base concave ; mouth-opening excentral, nearer the 

 anterior border ; peristome pentagonal. 



Dimensions. — Height, four tenths of an inch ; length, one inch and one tenth ; breadth, 

 nine tenths of an inch. 



Formation. — Kimmeridgien (" Calcaire des environs de Tonnerre et de Chablis), 

 Gray (Haute Marne)," Cotteau ; very rare. 



Collections. — M. Cotteau, M. Rathier. , 



EcHiNOBRissus TRUNCATus, Desor. Synopsis des Echinides Fossiles, p. 268. 



A new species with a very elongated form, nearly uniform in width throughout, 

 and slightly enlarged behind ; anal valley, supra-marginal ; the entire length of the sulcus 

 seen only when the posterior border is examined. 



Formation. — " Portlandien supericur (Virgulien) d'All pres Porrentruy. Tres rare." 



Desor. 

 Collection. — Mus. Bale. 



47 



