260 Panama Shells. AECID^. 



Area mutahiUs Orb. Voy. Amer. Merid. Moll.p. 638. 1846. 



Station. — Under stones ; Cuming I So-vverby : also Eeeve. 

 Our specimens were found under stones and in the crevices 

 of rocks, near low water mark. 



Habitat.— 1. of Plata; Cuming 1 Sowerby: also Eeeve: also 

 Orbigny. 

 "West Columbia ; Hanley. 

 I. of Plata ; Jay. 

 Panama and Taboga; 0. B. A. I 

 70 specimens were collected ; amdng them are some remark- 

 able varieties of form. 



410. Area (Byssoavca) pholadirorniis. Nov. sp. 



Shell extremely elongated, subcylindrical, contracted ante- 

 riorly, very inequilateral : inferior margin a little irregular, 

 somewhat excurved, scarcely gaping for the passage of the bys- 

 sus: posterior margin very oblique, moderately excurved : ante- 

 rior margin well rounded : dingy white : surface very finely and 

 closely fimbriated, with the concentric ridges larger except above 

 the posterior angle of the umbo, on which the concentric ridges 

 are lamellar : with the intersections nodular and deeply marked 

 beneath with the arcuate strisa of growth : umbones flattened, 

 with a very prominent and very oblique posterior angle, from 

 which the radiating ribs divaricate: beaks small: area of 

 ligament linear, nearly concealed : margins of the interior finely 

 crenulate ; teeth obsolete at the middle of the series, at the 

 ends divaricate. The sculpture is like that of A, divaricata 

 Reeve. 



Length 1.25 inch ; height .53 inch ; breadth .48 inch. 



Station. — In soft stones, near low water mark. 



^aJito^.— Taboga; 0. B. A. I 



2 specimens of this extraordinary shell were obtained. 



