CHIEFLY OF THE UNITED STATES. 13 



(nobis), but is a smaller species, with a higher umbonial slope and a higher carina. 

 It is also very near to rostriformis, (nobis), but is smaller, not so flat in the sides. 

 It is more polished, darker in the epidermis and higher on the umbonial slope. 

 Neither of the specimens are perfect enongh in the beaks to give the character of the 

 undulations of the tips. 



Unio oblatus. pi. 4, fig. 10. 



Testa Ic-evi, oblonga, subiuflata, ad latere parum planulata, in;i3quilaterali, postiee biaugulata ; valvulis 

 crassiusculis, antice crassioribus ; natibus prominulis ; epidermide tenebroso-castanea. eradiata. 

 polita; dentibus cardinalibus parviusoulis, tuberculatis, in utroque valvulo duplicibus ; lateralibus 

 longis, lamellatis reotisque ; margavita salmonea, aliquando albida et valde iridescent. 



Shell smooth, oblong, somewhat inflated, somewhat flattened at the sides, inequi- 

 lateral, biangular behind; valves somewhat thick, thicker before; beaks a little 

 prominent; epidermis dark chestnut, without rays, polished; cardinal teeth some- 

 what small, tnberculate and double in both valves; lateral teeth long, lamellar 

 and straight ; nacre salmon color, sometimes whitish and very iridescent. 

 Proc. Acad. Nat. Sci., 1863, p. 193. 



Hab. — Long Creek, Gaston County, North Carolina, C. M. Wheatley; North 

 Carolina, J. G. Anthony. 



My cabinet and cabinets of Mr. Wheatle}' and Mr. Anthony. 

 Diam. -7, Length 1-3, Breadth 2-4 inches. 



Shell smooth, oblong, slightly inflated, sometimes rather compressed, somewhat 

 flattened at the sides, biangular behind; substance of the shell somewhat thick, 

 thicker before ; beaks a little prominent ; ligament rather long, large and dark 

 brown ; epidermis dark chestnut color, without rays, polished on the sides and with 

 rather close marks of growth ; umbonial slope slightly raised and rounded ; posterior 

 slope rather narrow and carinate; cardinal teeth rather small, tnberculate, striate 

 and double in both valves ; lateral teeth long, lamellar, somewhat corrugate and 

 straight ; anterior cicatrices distinct, large and well impressed ; posterior cicatrices 

 confluent, rather large and slightly impressed ; dorsal cicatrices placed immediately 

 over the centre of the cavity of the beaks ; cavity of the shell rather shallow and 

 wide; cavity of the beaks very shallow and rounded; nacre salmon color, some- 

 times white, and very iridescent. 



RemarlvS. — Nearly a dozen specimens are before me, from Mr. Wheatley and Mr. 

 Anthony. The exact habitat of the latter's specimens was not mentioned. Several 

 specimens were much more compressed than the others, and these very closely re- 

 semble Burhensis, (nobis), in outline and epidermis, but they differ entirely in the 

 form of the cardinal teeth, and in Burlcensis having rays. The salmon color in the 



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