386 



NOTES 



On Foreign Jurassic species of the genus CLYPEUS nearly allied to British 

 forms, but which have not yet been found in the english oolites. 



Clypeus solodurinus, Agassiz. Syn. EcJiinoderm, Foss, Suisse I, p. 35, tab, v, 



figs. 1—3. 



Test very thick, narrow, and elongated, posterior border angular, produced, and 

 truncated ; ambulacra narrow, poriferous zones petaloidal, contracted at the lower fourth, 

 apical disc central ; anal valley lanceolate ; vent in its upper part, near the apical disc, 

 which is small and nearly central ; border undulated, base nearly flat, with prominent 

 inter-ambulacral cushions ; mouth-opening large, peristome surrounded by five lobes. 



Dimensions. — Antero-posterior diameter, two inches and nine tenths ; transverse 

 diameter, two inches and eight tenths ; height, eight tenths of an 

 inch. 



Formation. — " Oolite Vesulienne, d'Obergoesschen (Jura Soleurois) , Egg (Argovie) ; 

 Plasne pres Poligny (Jura) ." Desor. 



Collections. — MM. Strohmeyer, Bronn, Marcou. 



Clypeus Boblayi, Michelin. Cotteau and Triger. Echinides du depart, de la Sarthe, 



pi. xi, figs. 4, 5 ; p. 64. 



Test moderate size, sub-circular, round before, slightly truncated behind ; dorsal 

 surface much depressed, almost flat ; under surface sub-concave. Summit very excen- 

 trical posteriorly ; anterior ambulacral areas much longer than the posterior. Poriferous 

 zones widely petaloid on the upper surface, and becoming abruptly contracted near the 

 border, where the pores are simple and non-conjugate ; anal valley narrowly lanceolate, 

 and becoming regularly wider from the disc to the border. 



Dimensions. — Height, three quarters of an inch; antero-posterior diameter, three 

 inches and nine tenths ; transverse diameter, four inches and one 

 tenth. 



