127 



Length one and one-twentieth inches ; breadth one and seven- 

 twentieths inches. Inhabits the estuaries of Georgia. Cabinet of 

 the Academy and Philadelphia Museum. 



Several specimens of dead shells were brought up from the 

 bottom of the Sound, near Jeykill island, by the fluke of our 

 anchor. 



Amphidesma radiata. — Shell transversely oval, orbicular, a 

 little compressed ; apex nearly central, a little prominent ; posterior 

 slope somewhat concave near the beak ; anterior slope rectilinear 

 to the middle ; disk somewhat regularly wrinkled transversely, and 

 with minute longitudinal striae, white, with more or less rosaceous 

 radii, which are sometimes obsolete ; anterior submargin, with a 

 slight veiy obtuse undulation ; cardinal teeth two in each valve, 

 elevated, slender, unequal ; lateral teeth very distinct ; the 'poste- 

 rior one nearer the primaiy teeth, and shorter than the anterior 

 one ; interior ligament cavity profound, fusiform, nearly parallel 

 to the anterior slope ; within tinged with yellow, and the rosaceous 

 radii are distinct. 



Length nine-tenths inch ; breadth rather more than one inch. 



Many specimens of this pretty species were brought from the 

 Southern shores of East Florida, by Mr. Titian Peale, and I ob- 

 tained a worn individual a few years since, on the coast of Gleorgia, 

 measuring one inch and two fifths in breadth. 



It resembles the species I formerly described under the name of 

 A. oi'hiculata, but it is wider in proportion to the length, &c. 



Amphidesma lepida. — Shell very much compressed, subtri- 

 angular, remarkably thin, pellucid, equilateral, somewhat iridescent, 

 with numerous concentric wrinkles, and equally numerous very 

 minute regular, longitudinal striae, which, on the anterior margin, 

 curve towards the anterior edge, and on the posterior margin curve 

 in the same manner towards the posterior edge ; cardinal teeth 

 obsolete ; lateral teeth prominent. 



Length rather more than one-fourth of an inch ; breadth lesp 

 than one-fourth of an inch. 



This shell was sent to me by Mr. Elliott, who found it on the 

 coast of South Carolina. 



