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Hemiaster CoNRADi. Of a Small 

 size and very much swollen. Gen- 

 eral form, ovoid ; but having the 

 anal margin so much truncated as 

 to reduce the length to very nearly 

 that of the width. 



The height is to the width as about 6 to 7. 



CiDARis. Of a large size, but not sufficiently preserved for 

 specific description. The tubercles have a smooth base, not 

 crenulated. 



Arbacea ? The characters too indistinct for specific description. 



Accompanying the above Echinoderms, from the same deposit, 

 were specimens of the following genera : — Conus, Venus, Pec- 

 tunculus, Pecten, Natica, Turritella, and the claw of a Crusta- 

 cean. 



Mr. Bouve repeated the description given by him of the 

 Pygorynchus Gouldii, and published in the Proceedings of 

 the Society, December 16, 1846, in order to annex figures 

 of the same. 



Pygorhynchus Gouldii. Syn. Nuclcolites Mortoni. (Con- 

 rad.) Above conico-convex, a little more sloping posteriorly than 

 anteriorly. Margin somewhat rounded, except near and under 

 the anus, where, by an excavation or depression, it becomes 

 acute. Inferior surface, sub- 

 circular. Mouth situated 

 about one third of longitu- 

 dinal diameter from the an- 

 terior margin. Apex sub- 

 central, a little anterior, but 

 not so much so as the mouth. 

 Ambulacra radiating at un- 

 equal angles, the interam- 

 bulacral spaces dividing the 

 three anterior from the two 



posterior, being wider than ^^^^r 



the rest. The pores of each 



diverge considerably from the apex, becoming quite dilated a 



