CHIEFLY OF THE UNITED STATES. 261 



Hah. — Etowah River, Georgia, Rev. G. Wliite. 



My cabinet and cabinet of Mr. White. 

 Diara. 1-1, Length 1-6, Breadth 2-3 inches. 



Shell smooth, elliptical, very much inflated, inequilateral, obtusely angular behind 

 and rounded before ; substance of the shell rather thin, thicker before ; beaks 

 prominent, very much inflated; epidermis greenish-yellow, with distant marks of 

 growth, covered all over with thin, rather distant rays; ligament rather short, thick 

 and dark brown; umbonial slope much raised and very obtusely angular; posterior 

 slope broad, slightly carinate, subcordate ; cardinal teeth erect, pointed, compressed 

 conical and crenulate ; lateral teeth rather long, lamellar, curved and corrugate ; 

 anterior cicatrices confluent, large and well impressed ; posterior cicatrices confluent, 

 large and slightly impressed; dorsal cicatrices placed on the upper part of the centre 

 of the cavity of the beaks; cavity of the shell deep and rounded; cavity of the beaks 

 deep and obtusely angular; nacre white and very iridescent. 



Bemar/cs. — This species belongs to the group which embraces multlradlatus (nobis), 

 perovalis, Con., Spillmanii (nobis) and perradiatus (nobis). It is a much thinner 

 shell than AS^iZZma?iw, and is rather more inflated. It isyevy Yik.Q perradiatits,\)\xi 

 differs in being more elliptical, that shell being subtriangular, the valves somewhat 

 thicker, and the rays broader and closer together. There is a disposition in nearly 

 all the specimens before me to be slightly tinged witli salmon color in the cavity of 

 the beaks. In some of the specimens the green rays, which generally diverge over 

 the whole disk, are well marked and nearly equidistant. 



Unio punctatus. pi. 32, fig. 76. 



Testa lieri, elliptica, ad latere planulata, valde iutequilaterali, postice et autice rotundata ; valvulis 

 crassis, antice aliquanto crassioribus ; natibus vix prominentibus ; epidermide olivaeea, radiis 

 punctatis undique indutis ; dentibus eardlnalibus parvis, compresso-conicis crenulatisque ; 

 lateralibus longis, crassis subcurvisque ; margarita argeutea et iridescente. 



Shell smooth, elliptical, flattened at the sides, very inequilateral, rounded before 

 -and behind ; valves thick, somewhat thicker before ; beaks scarcely prominent ; 

 epidermis olivaceous, covered with interrupted rays; cardinal teeth small, 

 compressed conical and crenulate ; lateral teeth long, thick and somewhat cui'ved ; 

 nacre silvery white and iridescent. 



Proc. Acad. Nat. Sci. 1865, p. 89. 



Hah. — Caney Pork, Tenn., Dr. Edgar; and Tuscurabia, Ala., B. Pybas. 



My cabinet and cabinet of Mr. Pybas. 

 Diam. "8, Length 1-4, Breadth 2-2 inches. 



Shell smooth, elliptical, flattened on the sides, very inequilateral, rounded before 



