FISSURELLA. Panama Shells. 235 



Station. Unknown . 



Habitat. Panama ; C. B. A. ! 



Only 1 specimen of this extraordinary species was obtained. 



353. Crepidula rostrata. Nov. sp. 



Shell very convex, irregularly elliptic : livid brown, some- 

 times with pale ill-defined spots : irregularly somewhat corru- 

 gated both radiately and concentrically : apex very acute and 

 prominent, rostriform, very distant from but extending beyond 

 the posterior margin, slightly directed to the right : septum far 

 within the margin, planulate, usually very oblique to the plane 

 of the aperture : margin thin, irregular. 



Length .48 inch ; breadth .3 inch ; height .29 inch. 



Station. Unknown. 



Habitat. Panama ; C. B. A. ! 



5 specimens were obtained in different stages of growth. 



Family FISSUKELLID^E. 

 354. Fissurella aequalis. 



Synonymy. 



Fissurella cequalis Sowb. in Proc. Zool. Soc. Lond. p. 127. Nov. 1834. 



- Mull. Synop. Nov. Test. Viv. p. 158. May 1836. 



- Sowb. Conch. 111. No. 49. pi. 76. f. 56. 1841. 



- Reeve Conch. Icon. pi. 8. f. 55. Dec. 1849. 



Station. On dead shells in from 6 to 10 fathoms ; Cuming ! 

 Sowerby : also Eeeve. 



Habitat. St. Elena; Cuming! Sowerby: also Keeve. 



Panama ; C. B. A. ! 

 5 specimens were obtained. 



