FOREIGN OOLITIC CIDARIDiE. 65 



Genus— RABDOCWARIS. 



B. Species from the Inferior Oolite. 



Rabdocidaris maxima. Syn. Cidarites maximus. Miinst., in Goldf., Petrefact., p. 116, 



t. 39, fig. 1. 



Test large, very liigh, having at least seven tubercular plates in each inter-ambulacral 

 column ; areolas large, elliptical, confluent ; bosses with deeply crenulated summits ; 

 tubercles large ; scrobicular circles incomplete; granules small, not larger than those filling 

 the miliary zones ; ambulacra broad, with two rows of marginal granules, and an interspace 

 between ; poriferous zones nearly straight, and broad ; pores oblong, wide apart. Spines 

 long, round ; head large, neck long and smooth, stem swollen out in the middle ; surface 

 armed with irregularly disposed, forward- directed, thorny spines. 



Formation. — Inferior Oolite of Baireuth. Formation, Brauner Jura S, Quenst. 



Collection. — Museums of Bonn and Stuttgart ; plates and spine in my Cabinet. 



C. Species from the Coral Crag. 



Rabdocidaris nobilis. Syn. Cidarites nobilis. Miinst., in Goldf., Petrefact., p. 117, 



t. 39, fig. 4. 

 Agassiz, Echinod. Foss. Suisse, ii, p. 65, 



t. 21 a, fig. 21. 

 Desor, Synopsis Echinides Foss., t. 8, 

 fiK. 10. 



'o- 



Test large, thin, spheroidal, depressed at both poles ; ambulacra broad, slightly flexed, 

 with six rows of small granules ; poriferous zones narrow ; pores small, round, separated 

 by thick septa : inter-ambulacra wide ; seven large plates in each column ; areolas large, 

 circular, superficial ; bosses small, not prominent, summits deeply crenulated ; tubercles 

 large and prominent ; scrobicular circles complete ; granules small, a little larger than those 

 filling up the zones. The scrobicular circles of the lower plates touch ; those of the upper 

 plates are separated by a mihary space ; miliary zone very wide, covered with numerous 

 granules, which diminish in size from the scrobicular circle to the centro-sutural line, 

 which is very distinctly visible. Spines long, cylindrical or sub-prismatic ; the head 

 large J neck smooth, concave; stem very long, sometimes twelve inches in length, Quenstedt; 



9 



