218 Panama Shells. CALYPTR^ID^E. 



Panama ; C. B. A. ! 

 12 specimens were collected. 



328. Hipponyx Panamensis. 



Synonymy. 



Hipponyx mitrula Sowb. (non Lam.) in Proc. Zool. Soc. Loud. 



p. 5. - Jan. 1835. 



Sowb. (non Lam.) Thes. in Conch, p. 369. No. 



2. pi. 73. f. 18-20. 1846. 



We propose this name for a shell, which Mr. Sowerby seems 

 to have confounded with H. mitrula Lam. The Lamarckian 

 shell is the Caribbean species, which has a curved apes that is 

 sometimes much elongated, " apice adimco " Lam. The Panama 

 shell is obliquely conic, with the apex moderately prominent. 

 The concentric laminge are more numerous and the radiating 

 strise on them are more deeply impressed than in the Caribbean 

 shell. This species is thick and solid. 



Length .67 inch ; breadth .7 inch ; height .37 inch. 



A dead specimen of Cardita affinis has on one valve 4 rather 

 small individuals. The attached valves are rather thin, and have 

 been more or less perforated, from within the Cardita, by some 

 boring animal. Around the perforations there is a thicker 

 deposit, which fills up some of them. 



Station. On stones in 17 fathoms water, among coarse sand; 

 Cuming ! Sowerby. Our specimens were found on stones and 

 shells near low water mark. 



Habitat. Lobos I. ; Cuming ! Sowerby. 



Panama ; C. B. A. ! 

 14 specimens were collected. 



329. Hipponyx radiata. 



Synonymy. 



Hipponyx radiata Sowb. in Proc. Zool. Soc. Lond. p. 5. Jan. 1835. 

 - Sowb. Thes. Conch, p. 3 70. No. 4. pi. 73. f. 24, 25. 1846. 



