AMPHIDESMA.— Plate III, 



Species 19. (Mus. Cuming.) 



Amphidesma Californica. Amph. testa oblongo-ovali, 

 ituBquilaterali, fuscescente-alba, sordide fitsco pallide 

 radiatd, coneentrice sulcata, liris intermediis obtuse ele- 

 valis subcorriigatis, stilcis creberrime radiatim striatis ; 

 latere antico oblonyo-rotundato, postko subtruncato, 

 valde Jlexuoso ; intus albidd aut lutescente. 



The Californian Amphidesma. Shell oblong-oval, 

 inequilateral, brownish-white, faintly rayed with dull 

 brown, concentrically grooved, the intermediate ridges 

 being obtusely raised and somewhat wrinkled, grooves 

 very closely radiately striated ; anterior side oblong- 

 rounded, posterior slightly truncated, very flexuous ; 

 whitish or yellowish within. 



Semek Californica, A. Adams, Zool. Pro. Soc. July, 1853. 



Hab. Gulf of California. 



An obtusely wrinkle-ridged species, densely rayed from 

 the umboes with minute striae. 



Species 30. (Mus. Cuming.) 



Amphidesma proxima. Amph. testa suborbiculari, pos- 

 tici paululum Jlexnosd et subtruncatd; alba, epidermide 

 tenui sordidd plus minus decidud, coneentrice irregtdari- 

 ter Jlexuoso-lirutd, striis minutis numerosis rndiantlbiis. 



The allied Amphidesma. Shell nearly orbicular, a 

 little flexuous and slightly truncated on the posterior 

 side ; white, with a thin more or less deciduous dirty 

 epidermis, concentrically irregularly Hexuously ridged, 

 with numerous minute radiating striie. 



C. B. Adams, Cat. Shells of Panama, p. 292. 



Hab. Panama. 



A fine large species with somewhat of a i?<c<«a-aspect. 



