288 Panama Shells. mactridjs. 



Habitat. — Bay of Caraccas ; Cuming 1 Sowerby. 



Panama ; 0. B. A. I 

 4 specimens were obtained. 



480. Cuming^ia trigonularis. 



Synonymy. 



Cumingia trigonularis Sowb. in Proc. Zool. Soc. Lond. p. 35. Mar. 1833. 



So-wb. Gen. pi. — . f. 2. 



Reeve Conch. Syst. pi. 49. f. 2. Sept. 1841. 



Station. — Among stones in deep water ; Cuming I Sowerby. 



Habitat. — St. Elena : Cuming ! Sowerby. 

 Panama ; C. B. A. I 



3 specimens were found. 



481. Cumingia . Sp. indet. a. 



4 specimens were obtained near Panama. 



482. Cumingia . Sp. indet. h. 



1 specimen was obtained near Panama. 



483. Cumingia . Sp. indet. c. 



1 valve was found near Panama. 



484. Cumingia . Sp. indet. d. 



1 specimen was found near Panama. 



The above are probably new species of Qumingia ; but as 

 their characters are probably somewhat variable, more speci- 

 mens are requisite for good descriptions. 



485. Amphidesma bicolor. Nov. sp. 



Shell elliptical, scarcely flexuous, inequilateral, the posterior 

 side being larger ; with the posterior dorsal margin a little con- 



