TBLLINA. Panama Shells. 279 



Station. — Unknown. 



Habitat. — Mazatlan ; Lt. Green I G-ould MSS. 



Santa Barbara ; Col. Jewett I Gould MSS. 

 Panama ; 0. B. A. I 



1 valve only was obtained. 



TELiIillVA. — The number of species in this genus which 

 occur at Panama is extraordinary : it will be seen that 19 were 

 collected. 



468. Tellina aurora f 



Synonymy. 



Tellina aurora Hanley in Proc. Zool. Soc. Lond. p. 147. Sept. 1844. 



Hanley in Sowb. Thes. Conch, p. 301. 



No. 153. pL 58. f. T6. ... 1846. 



Station. — Soft sandy mud in 10 fathoms ; Cuming I Hanley. 



Habitat. — Panama; Cuming 1 Hanley. 

 Rio Janeiro ; Jay. 

 Panama ; 0. B. A. ! 



2 entire specimens were found. 



Probably there is some error in Dr. Jay's statement. One of 

 our specimens is colorless, and both of them are a little more 

 acuminated posteriorly by the more descending slope of the 

 dorsal margin than the specimen which is figured in the The- 

 sauriLs. An odd valve is less acuminated. 



459. Tellina cog;nata. Nov. sp. 



Shell subelliptical, solid, convex, subequilateral ; ventral 

 margin slightly excurved ; anterior margin broadly rounded ; 

 anterior dorsal margin nearly straight, sloping ; posterior dor- 

 sal margin slightly concave, sloping equally with the posterior 

 dorsal; posterior extremity somewhat obliquely and very 

 broadly truncated ; flexure slight ; white, with a pale reddish 

 or brownish tinge ; with excessively minute unequal radiating 



