UNITKl) STATKS. 81 



nacre oi' 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 complanatun, 

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

 The raai'ks of growth ai'e three in both specimens, excpedingly well marked with 

 ver\' distant, brnnd, dark bands. 



Unio S.\vanxaiik.vsis. Pi. Iti, lig. (U. 



Testa l;vvi, oblong;!, inflata, ad latere planulata, postice obtusL' angulata, inEequilatcrali, valvulis crassis, an- 

 tici) crassioribus ; natibus prominulis, ad apices undulatis ; epidermidc vel rufo-fusca vel tenebroso-fusea 

 ct obsolete radiata; dentibus cardinalibus subgrandibus, pjramidatis, in utroque valvule duplicibus; 

 lateralibus prxlongis, lamollatis curvisque ; margnrita vol alba vel pallida purpurea vel salmonis colore 

 tincta et iride.scentc. 



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

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

 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. 

 Proe. Acad. Nat. Sei. 1857, p. 169. 



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

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

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



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

 Diara. 1-4, Length 22, 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 impres.sed ; posterior cica- 

 trices confluent, large and Avell 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. 



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

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

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

 tlie uniltonial slope and more striate. In the nncro it diflersin hr>int; usually of a deop 



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