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nacre of the complete specimen is pure white, the odd valve is disposed to a salmon 

 tint in the cavity of the shell. The obscure rays are like those of complanatus, 

 and. in more perfect specimens they may be more distinct than in those before me. 

 The marks of growth are three in both specimens, exceedingly well marked with 

 very distant, broad, dark bands. 



Unio Savannahensis. PL 16, fig. 61. 



Testa lsevi, oblonga. inflata, ad latere planulata, postice obtuse angulata, ingequilaterali, valvulis crassis, an- 

 tice crassioribus ; natibus prorainulis, ad apices undulatis ; epidermidc vel rufo-fusca vel tenebroso-fusca 

 et obsolete radiata ; dentibus cardinalibus subgrandibus, pyramidatis, in utroque valvulo duplicibus; 

 lateralibus prcelongis, lamellatis curvisque ; margarita vel alba vel pallida purpurea vel salrnonis colore 

 tincta et iridescente. 



Shell smooth, oblong, inflated, flattened at the sides, obtusely angular behind, inequi- 

 lateral ; valves thick, thicker before ; beaks a little prominent, undulated at the tip ; 

 epidermis reddish or dark brown, obscurely rayed; cardinal teeth rather large, pyra- 

 midal, double in both valves; lateral teeth very long, lamellar and curved; nacre 

 white or pale purple or salmon color and iridescent. 

 Proc. Acad. Nat. Sci. 1857, p. 169. 



Hah. — Savannah River, also Brantley's Mill, Washington County, Georgia, Rev. 

 G. White ; Santee Canal, South Carolina, Dr. Ravenel ; and Sugar Creek, Mecklen- 

 burg County, North Carolina, C. M. Wheatley. 



My cabinet and cabinets of Mr. White and Mr. Wheatley. 

 Diam. 1*4, Length 2*2, Breadth 3'9 inches. 



Shell smooth, oblong, inflated, flattened at the sides, obtusely angular behind and 

 regularly rounded before ; inequilateral ; substance of the shell thick, thicker be- 

 fore ; beaks a little prominent, with numerous, small, concentric undulations at the 

 tip ; ligament rather long and thick ; epidermis reddish brown or dark chestnut 

 brown, somewhat bright on the umbones and striate and rough towards the margin, 

 with obscure rays and distant well marked broad lines of growth ; umbonial slope 

 raised into a well defined angle ; cardinal teeth rather large, pyramidal, crenulate, 

 double in both valves ; lateral teeth very long, lamellar, curved and enlarged at pos- 

 terior end ; anterior cicatrices distinct, large and deeply impressed ; posterior cica- 

 trices confluent, large and well impressed ; dorsal cicatrices rather large, and placed 

 across the centre of the cavity of the beak ; palleal cicatrix deeply impressed ; cavity 

 of the shell rather deep and wide ; cavity of the beaks shallow and rounded ; nacre 

 white, pale purple or salmon and iridescent. 



Bemarhs. — Quite a number of specimens from Georgia and North and South Caro- 

 lina were received, but none in alcohol. It belongs to the complanatus group, and is 

 nearest to Cuvierianus (nobis.) It differs in being flatter on the side, more carinate on 

 the umbonial slope and more striate. In the nacre it differs in being usually of a deep 



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