240 Panama Shells. FissUEELLlDiB, 



Station. — On rocks above and below half tide level. 



Habitat. — Panama ; Sowerby. 



Peru ; Voyage of tbe Venus. 

 Gallapago Is. ; Jay. 

 Taboga ; 0. B. A. 

 220 specimens were collected. 



Nearly one half of the specimens, which we have included 

 in this species, are intermediate between this and S. characteristica. 

 There is so little constancy in the two forms, that the distinction 

 is a source of much perplexity. 



365. Siphonai'ia maura. 



Synonymy. 



Siphonaria maura Sowb. in Proc. Zool. Soc. Lond. p. Y. Jan. 1835. 

 Reeve Elem. Conch, pi. 24. f. 144 ? 1848 ? 



Station. — On rocks ; Cuming I Sowerby. Our specimens were 

 found on ledges of rocks, mostly above half tide level. 



Habitat. — Panama; Cuming! Sowerby. 



Panama ; C. B. A, I 

 200 specimens were collected, 



366. Siphonaria pica? 



Synonyrny. 

 Siphonaria pica (?) Sowb. in Proc. Zool. Soc. Lond. p. 6. Jan. 1836. 

 Station. — On rocks in exposed situations ; Cuming I Sowerby. 



Habitat. — Acapulco ; Cuming ! Sowerby. ' 



Panama; Jay. 



Panama ; C. B. A. 1 

 8 specimens were found. 



Is not Mr. Sowerby in error when he represents Mr. Cuming 

 as having made collections at Acapulco ? 



