24 AMERICAN- COBBICCXADJB. 



Long. l.Sl; Lat. 1.56 ; Diam. 1.20 inches. 

 . •• 45 ; ~ 39 ; ~ 30 Tnill- 



Haz: Narth ArQ^rics, in the State of Calif<»iu&. (Cabinet of Cuming.) 



C : .) Proc. Zool. XXII, 1854,21. 

 C- - .- : .-__^. Ac. ^^ S. PhiL 1560,276. 



The only specimen I hare seen of this rare species is the one in 

 the collection of 31r. Cuming. In shape this shell is somewhat 

 lite that of the C. radiaia. but othenrise they are \ridely distinct ; 



it is Tciy different from all other species of the genns. 



•20. Ciieua panameiiii>. Pshte. — Shell OThicnlar-snbtrigonal, 



-ral : anterior side short, concare on the 

 -.-■-- . ... ..--_.- ^ -_^ — ._^-i ia from; posterior side broader, ob- 



liqnelj tmncated, obtuse at extremitT ; beaks large, very prominent, oppo- 

 site, apjw^ximate at apes ; strise light, irregular : epidermis brownish- 

 green ; hinge-marrin very narrow ; cardinal teeth unequal, small, diver- 

 cent : anteric r ih. thicker than the po5teri(». 



_.__. ^-.': Lat, 2.(<S; Diam. 1.6S inches. 

 55; " 52; - 42 miU. 



Hfit. Central Ai_-: ~ ~ - . :f the British Museum 



and Cum:r:g/' 



C -2. Deshates, (t :. Zool. XXU, 1S54 23. 



C r : ^;. >. S. PhiL 1860, 283. 



A rar- ;l.-r.-, --r .-.v ;\ r . _r-i I have seen is the one from Mr. 

 CnmiDg's collection. Compared with C. cumingii it is smaller, 

 more tumid, transversely less elongated : it differs from C. mari- 

 tima in being more tumid, transversely shorter, and in having more 

 prominent beaks. 



■-21. Cyrena recllLZii- Peoce, — Shell heart-shaped, inflated, sub- 

 equilateraL tumid ; anterior side rounded ; poste- 

 Rg. 19. jior side subtnincate ; beaks prominent, inclined 



anterior! V. approximate at ap>es ; lunula obsolete ; 

 striae irregular ; epidermis dark brownish-green ; 

 valves s<^d, fulL interior whitish : hinge-marein 

 curved, broad ; cardinal teeth unequal, divereent, 

 bi£d ; anterior lateral tooth narrow, robust, nearer 

 '.he cardinal teeth ; posterior tooth lamellar, dis- 

 tant. 



Long. 2.95 : Lat. 2.96 ; Diam. 2.20 inches. 

 74; " 74; "■ 55 milL 



Hab. Central America. (Cabinet of Ctiming.) 



