FOREIGN OOLITIC CIDARID^E. 63 



Test moderate sized, much depressed ; ambulacra flexuous and prominent, with four 

 rows of small, close-set granules in the middle, diminishing to two rows in the upper and 

 lower parts of the area; poriferous zones sunk; pores small, round, contiguous; inter- 

 ambulacra with from four to five plates in each column ; areolas large, circular ; rim pro- 

 minent, surmounted by a scrobicular circle of round, prominent, spaced-out granules ; 

 bosses with feebly crenulated summits above, nearly, if not quite, smooth below ; tubercles 

 large and prominent ; disc opening very large ; miliary zone filled with numerous small, 

 round granules ; a considerable granulated space between the scrobicular circles. Spines 

 round, with the head large ; neck long, smooth ; stem swollen out, and then gradually 

 tapering to a blunt point; surface covered with a confluent granulation, arranged in 

 parallel carinated, longitudinal lines. 



Formation. — Coral Rag of Sigmaringen, Wurttemberg, and Bavaria. Formation y, 

 Quenstedt. 

 Coral Rag Inferieur, et Calcaire a Chailles, Chatel-Censoir et Druyes, 

 Yonne. 



Collections. — In all the Foreign Collections. 



British Museum, Bristol Museum, Scarborough Museum. It is often 

 mistaken for and ticketed as a British fossil. My Cabinet. 



Cidaris margin ata. Goldf., Petrefact., p. 118, t. 39, fig. 7. 



Test nearly as large as Cidaris Blumenbachii, slightly depressed at both poles ; ambu- 

 lacra prominent, with six rows of small, compressed granules in the middle of the area, 

 diminishing to four rows above and below ; five or six pairs of plates in the inter-ambu- 

 lacra ; the areolas large, circular, and much excavated ; margin prominent, and surrounded 

 with a circle of scrobicular granules, not much larger than those filling the miliary zone ; 

 bosses small, with smooth summits ; tubercles large ; poriferous zones deeply sunk ; pores 

 small, round, and contiguous ; miliary zone wide, filled with small, close-set granulations. 

 Spines round ; head and acetabulum large, with a smooth rim ; neck thick, short, and 

 smooth ; stem covered with lines of granules. 



Formation. — Coral Rag of Nattheim. Formation t, Quenstedt. 

 Jura Superieur Heidenheim. 



Collections. — Museums of Bonn, Tubingen, Stuttgart, and others. 

 British Museum, my Cabinet. 



