286 Panama Shells. PETRICOLIDJS. 



a tinge of blue or grey ; some whitish specimens are orna- 

 mented with bluish purple zigzag lines on the umbones, or 

 with a short ray of the same color before the beaks : with deep 

 unequal crowded concentric striae : beaks prominent : ligament 

 short, conspicuous : lateral teeth rather small. This species is 

 closely allied to T. bimaculata. and has similar varieties of color- 



/ ' 



ing, but is larger, higher, and has coarser strias. 

 Length .95 inch ; height .78 inch ; breadth A inch. 



Station. Unknown . 



Habitat. Panama ; C. B. A. ! 

 10 specimens were collected. 



474. Tellina . Sp. indet. a. 



L valve, obtained near Panama, resembles an overgrown 

 T. elongata Hanley, which species Mr. Cuming found at Chiri- 

 qui : but the figure of that species in Sowb, Thes. represents 

 the umbonial angles as concave upwards, but in this shell they 

 are convex upwards, and consequently the posterior area is 

 less. Our specimen is more than 3 inches long. 



475. Tellina - -. Sp. indet. b. 



A long elliptic plain white shell; 1 valve was found near 

 Panama. 



476. Tellina - . Sp. indet. c. 



Like T. puetta, but less rostrate and more deeply striate ; 5 

 odd valves were found near Panama. 



Family PETBICOLID^E. 

 477. Petricola cognata. Nov. sp. 



Shell pholas-shaped, inequilateral : dingy white : in the 

 upper posterior area with very fine crowded radiating equal 



