256 NEW UNIONIDiE, MELANID^, ETC., 



Unio PROPraus. PI. 31, fig. 70. 



Testa liEvi, oblonga, subinflata, mieanti, inajquilaterali, postiee obtuse aDgulata; antice rotunda; 

 valvulis subtenuibus, autice crassioribus ; natibus promiuulis, ad apices undulatis; epidermide 

 lutea, eradiata; dentibus cardinalibus parvis, acuminatis, erectis, compressis ; lateralibus sublougis 

 subcurvisque ; margarita vel purpurea vel salmonis colore tiucta et iridescente. 



Shell smooth, oblong, somewhat inflated, shining, inequilateral, obtusely angular 

 behind, round before; valves rather thin, thicker before; beaks a little prominent, 

 undulate at the tips; epidermis yellow, eradiate; cardinal teeth small, pointed, 

 erect, compressed; lateral teeth rather long and somewhat curved; nacre purple or 

 salmon and iridescent. 



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



Hah. — Lafayette, Georgia, Rev. G. White. 



My cabinet and cabinet of Mr. White. 

 Diam. -6, Length -9, Breadth 1-5 inch. 



Shell smooth, oblong, somewhat inflated, inequilateral, shining, obtusely angular 

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

 a little prominent, undulate at the tips; ligament short, thin and pale brown; 

 epidermis yellow, eradiate, with distant marks of growth ; umbonial slope slightly 

 raised and very obtusely angular ; posterior slope narrow elliptical and somewhat 

 carinate ; cardinal teeth small, pointed, erect, compressed ; lateral teeth rather long, 

 lamellate and somewhat curved; anterior cicatrices distinct, rather large and 

 moderately well impressed ; posterior cicatrices confluent, rather large and slightly 

 impressed ; dorsal cicatrices placed over the centre of the cavity of the beaks ; cavity 

 of the shell rather shallow and wide ; cavity of the beaks rather shallow and obtusely 

 angular; nacre purplish and pale salmon in the cavity, and whitish on the border. 



Remarlcs. — Several specimens are before me. It is a small species, and rather less 

 and thinner than nitens (nobis). All these specimens have the nacre white on the 

 margin, with a salmon cavity increasing in tint to a purplish color in the cavity of 

 the beaks. In outline it is very near to merus (nobis), but it is not I'ayed, and it is 

 rather more compressed. It differs in color inside and out. In having a salmon and 

 purplish nacre, it resembles nitens. It also reminds us of &M.xeu.s- (nobis). None of 

 the beaks were perfect, but the tips presented three or four rather coarse undu- 

 lations. 



Unio protensus. PL 31. fig. 71. 



Testa Ifcvi, late elliptica, subcompressa, valde intequilaterali, postiee subbiangulata, antice rotunda ; 

 valvulis subtenuibus, antice aliquauto crassioribus ; natibus prominulis ; epidermide tenebroso- 

 fusca, obsolete radiata ; dentibus cardinalibus minimis, obliquis striatisque ; lateralibus prelongis 

 subcurvisque ; margarita vel cajruleo-alba vel salmonea et iridescente. 



