FOREIGN OOLITIC CIDARIDiE. 67 



Genus— DIPLOCIDARIS. 



Diplocidaris gigantea. Syn. Cidaris gigantea. Agass., Echin. Foss. Suisse, ii, p. 66, 



t. 21, fig. 22. 

 ,, „ Quenstedt, Petrefactenkunde, t. 48, 



fig. 45. 

 Diplocidaris gigantea. Desor, Synopsis Echinides Foss., 



t. 1, fig. 5. 



Test large ; ambulacra straight, with two rows of marginal granules ; poriferous zones 

 wide ; pores bigeminal throughout ; interambulacra wide ; areolas superficial, small in 

 proportion to the size of the plates ; bossal summits deeply crenulated ; tubercles small 

 and perforated ; scrobicular circle composed of large, mammillated, spaced-out granules. 

 Miliary zone wide, filled with granules placed wide apart; between the areolas and the 

 poriferous zones, there is a wide miliary zone ; the uppermost plates of the inter-ambulacra 

 are destitute of primary tubercles, the miliary granules covering their entire surface. Spines 

 stout, cylindrical ; stem covered with numerous equal-sized granules, which are nearly 

 longitudinal in their disposition, but have no connecting calcareous filament ; acetabulum 

 large, rim deeply crenulated, ring prominent, neck short and smooth. 



Formation. — Coral Rag of Besancon, Salins, Chatel-Censoir, and Druyes, Yonne. 



Coral Rag of Nattheim, " Weissen Jura, &c, bei Ulru," Querist. 

 Wiirttemberg. 



Collections. — Museum of Vienna (Dudressier Collection), Tubingen, Collections of 

 M. Cotteau and M. Michelin. 



