46 DESCRIPTION OF FIFTY-TWO SPECIES OF TJNIONID^. 



Proc. Acad. Nat. Sci., 18t2, p. 159. 

 Jjah. — Savannah Kiver, at Governor Hamilton's, Geo., Dr. Barratt. 



My cabinet. ' 



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



Shell smooth, very veide, somewhat compressed, flattened at the sides, very ine- 

 quilateral, pointed and subbiangular behind, obliquely rounded before ; substance 

 of the shell somewhat thick ; beaks a little prominent, nearly terminal, minutely 

 undulate at the tips; ligament long, thin and light brown; epidermis dark brown, 

 very much rayed, with rather distant marks of growth ; umbonial slope slightly 

 raised and obtusely angular; posterior slope narrow-elliptical, subcarinate ; car- 

 dinal teeth small, sulcate and disposed to be double in both valves; lateral teeth 

 long, straight and lamellar ; anterior cicatrices distinct, rather small and well im- 

 pressed ; posterior cicatrices confluent, large and slightly impressed ; dorsal cica- 

 trices placed nearly in the centre of the cavity of the beaks; cavity of the shell 

 shallow and wide ; cavity of the beaks scarcely perceptible; nacre white or purple 

 and very iridescent. 



Remarks.--The odd valves of two adults and several complete young specimens 

 are before me. It is a very wide species, allied to folliculatus (nobis). It is nearly 

 of the same outline with nasutus, Say, but may be easily distinguished by its being 

 a thicker, more robust shell, in being rather more compressed and in having more 

 oblique rays. 



Unio subparallelus. pi. 16, fig. 44. 



Testa Isevi, oblonga, subcompressa, ad latere planulata, insequilaterali, postice subbiangulari, antice 

 rotundata; valvulis crassiuscnlis, antice parum crassioribus ; natibus prominulis, ad apices con- 

 centrico-rugoso-undulatis; epidermide tenebroso-fusca, nitida, radiata; dentibus cardinalibus 

 parviusculis, conicis, rugosis, in utroque valvulo subduplicibus ; lateralibas prselongis, lamellatis 

 subcurvisque ; margarita salmonis colore tincta et valde iridescente. 



Shell smooth, oblong, somewhat compressed, flattened at the sides, inequilateral, 

 subbiangular behind, rounded before ; valves rather thick, slightly thicker before ; 

 beaks a little prominent, at the tips concentrically and roughly wrinkled ; epider- 

 mis dark brown, shining and radiate ; cardinal teeth rather small, conical, rugose 

 and somewhat double in both valves ; lateral teeth very long, lamellar and some- 

 what curved; nacre salmon colored and very iridescent. 

 Proc. Acad. Nat. Sci., 1872, p. 158. 



Ha&.— Irwin's Creek and Fox River, North Carolina, C. M. Wheatley. 



My cabinet and cabinet of C. M. Wheatley. 

 X)iam. -9, Length 1-4, Breadth 2-7 inches. 



