FOREIGN OOLITIC CIDARIDtE. 61 



The spines referred to this species by M. Merian cannot positively be said to belong 

 to it. 



Formation. — Terrain a, Chailles, Corallien. 



Localities. — Fringeli, Canton de Solenre. 



Corallien de Besancon, du departement de l'Yonne. 



Nattheim, Wurttemberg. Formation e, Querist., d'Ulm, Wurttemberg. 



Collections. — Museum of Vienna (Dudressier Collection). 

 British Museum. 



Cidaris Drogiaca. Cotteau, Etudes sur les Echinides Foss., p. Ill, t. 11, figs. 1, 2. 



Test very large, inflated, depressed both on the upper and under surfaces ; tubercles 

 large and prominent ; bosses large, with deeply crenulated summits ; uppermost plates of 

 the inter-ambulacra with rudimentary tubercles, destitute of areolas ; scrobicular circle 

 elliptical ; granules large and perforated ; granules of the miliary zone likewise large, distant, 

 and perforated ; ambulacra narrow, with two rows of perforated granules ; poriferous zones 

 very narrow ; pores very small and contiguous. 



Formation. — Calcaire a Chailles de Druyes (Yonne). 

 Coral Rag Inferieur de Chatel-Censoir. 



Localities. — Druyes, Chatel-Censoir, Yonne. 



Collection. — M. Cotteau, Ecole des Mines, Paris. 



Plaster mould, in my Cabinet, sent by M. Cotteau. 



Cidaris Suevica. Desor, Synopsis des Echinides Foss., p. 7, t. 1, fig. 2. 



Test large, inflated, depressed on the upper and under surfaces; areolas circular, 

 deeply excavated ; bosses prominent, summits finely and deeply crenulated ; tubercles 

 moderate sized j miliary zone covered with a fine, abundant, homogeneous granulation ; 

 scrobicular circle with granules of the same size as those filling the zone ; ambulacra with 

 two rows of unequal-sized granules. 



Formation — Argovien ? 



Locality. — Wurttemberg. 



Collections. — Museums of Tubingen, Zurich. 



