FOREIGN OOLITIC CIDARIDiE. 67 



Genus— mVLOClDAmS. 



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



t. 21, fig. 22. 

 „ „ Quenstedt, Petrefactenkunde, t. 48, 



fig. 45. 

 Bvplocidaris 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. 

 Mihary 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 Besangon, Salins, Chatel-Censoir, and Druyes, Yonne. 



Coral Rag of Nattheim, " Weissen Jura, &c., bei Ulm," Quenst. 

 Wiirttemberg, 



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

 M. Cotteau and M. MicheHn. 



