ECHINODERMATA. 



161 



No. 785. Pseudodiadema Orbignyanum, Cott. 



With spines, on slab. From the Coral Rag (Middle Oolite), Department of 

 Yonne, France. Price, $0.60. 



No. 786. Pseudodiadema Orbignyanum, Catt. 



From the same formation and locality as the preceding. 



Price, $0.30. 



No. 787. Phymosoma ( Cyphosoma ) Kcenigii, Mant. 



This Cidarite, with wide ambulacra, large, imperforated tubercles, and de- 

 pressed shell, is from the Upper Chalk, Sussex, England. Price, $0.40. 



No. 788. Phymosoma Beaumonti, Agass. 



From the Chalk of Plaisance, France. Price, $0.30. 



No. 789. Rhabdocidaris copeoides, Desor. 



(Syn. Cidaris copeoides, Agass.) Four 

 specimens of spines. This Urchin be- |j 

 longs to the Cidaridm having narrow |j 

 ambulacra. The spines vary very much I 

 in size and form on different parts of the " 

 test, and at different stages of devel- 

 opment. From the Oxfordian (Middle 

 Oolite), Latrecy, France. Price, $0.75. 



No. 790. Rhabdocidaris nobilis, Desor. 



From the Coral Rag (Middle Oolite), Nattheim, Wirtemberg. Price, $0.50. 



No. 791. Stirechinus Scillae, Desm. 



(Syn. Echinus costatus, Agass.) From the Pliocene Tertiary of Sicily. 



Price, $0.30. 



No. 792. Stomechinus Robinaldinus, Cott. 



This beautiful Cidarite with wide ambulacra and imperforate tubercles, is 

 very rare. From the Coral Rag (Middle Oolite), Tonnerre, Yonne, France. 



Price, $0.50. 



IRREGULAR. 



Cassichdidse. 



No, 793. Amblypygus Americanus, Mich. 



From the Nummulitic (Middle Eocene) of the Island of Jamaica. Price, 



).30. 



N§. 794. Botriopygus obovatUs, D'Orb. 



This Urchin, from the Upper Neocomian (Cretaceous) of Switzerland, is often 

 confounded with Pygaulus Morloti, Desor.; but it differs in not being regularly 

 ovoid — being enlarged posteriorly, and by its sub-anal furrow. Price, $0.30. 



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