Notes on Species of the Family Corbiculadm. 299 



55. Corbicula Delessertiana, nov. spec. 



C. testa ovato- transversa, sequilaterali ; extremitatibus rotun- 

 datis ; regulariter striata; umbonibus tumidis, prominentibus, 

 colore violaceo sabradiatis ; epidermide nitente viridescente 

 vestita ; valvis intus violaceis. 



Long. 20 ; lat. 17 ; diam. 11 mill. 



Hab. — Smyrna, Asiae Minoris et Egypta. Collect. Morelet 

 et Prime. 



The specimens of this species in the cabinet of M. Morelet came 

 from Smyrna, and those in mine from the Pyramids, but I have 

 been unable to detect any material difference between them. 



Named in memory of Baron Delessert, of Paris, who was in 

 possession of the original Lamarck collection. 



56. Corbicula imperialis, nov. spec. 

 C. testa ovato-transversa, compressiuscula, sequilaterali ; latere 

 antico rotundato, postico subtruncato ; umbonibus brevibus ; 

 margarita violacea; regulariter et dense striata; epidermide 

 subnigra, nitente vestita. 



Long. 27 ; lat. 23 ; diam. 14 mill. 

 Hab. — Pondicherry, Indise. Collect. Prime. 



57. Corbicula Amazonica, Anthony, nov. spec. 



C. testa ovato-trigona, obliqua, compressiuscula, subinsequila- 

 terali ; latere antico breviore, rotundato, postico elongato, sub- 

 angulato ; umbonibus prominentibus, obliquis ; regulariter et 

 dense striata; epidermide olivacea vestita; valvis intus violaceis.; 

 sinu pallii brevi. 



Long. 18; lat. 16; diam. 10 mill. 



Hab. — Flumen Amazonicum, America? Meridionalis. Collect, 

 loco Cambridge dicto, Mass., et Prime. 



This species was found in the stomach of a fish collected by 

 Professor Agassiz's expedition to Brazil, in the Amazon river. 

 Very closely allied to Corb. obsolela from Uruguay ; it is, how- 

 ever, smaller and less heavy ; it may possibly prove to be the 

 young of that species. 



