NEW UXrOXID.E OF THE UNITED STATES. (Jl 



luululate at the tips; lif;anicnt lonfr, thick and (hnk lirown ; cplilcnnis dark hrowii, 

 rayed, .shining above and striate below; unibouial slope somewhat raised and obtusely 

 anguhir; posterior slope long, narrow and very slightly raised; cardinal teeth rather 

 large, compressed, crenulate and double in both valves; lateral teeth very long, lamel- 

 lar, straight and enlarged towards the posterior end ; anterior cicatrices distinct, 

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

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

 of the shell shallow and Avide ; cavity of the beaks very shallow, scarcely observable ; 

 nacre white and iridescent. 



Remarlis. — This is a fine species, belonging to the group of which nasutiis, ^ay, is 

 the type. It is closely allied to Flfheriamis, (noliisj, but differs in being larger, 

 stouter, and a more expanded shell. The young and more perfect specimens have 

 rays, which are obsolete in the old and more imperfect specimens. There are three or 

 four undulations of the tips which are coarser than in nasutus. It is with great pleasure I 

 dedicate this fine species to Prof. E. Emmons, to whose kindness I am indebted for so 

 many interesting new species, collected in various parts of North Carolina, during his 

 important geological survey of that State. 



Unio Gextiiii. pi. 2, fig. ^104. 



Testa laevi, oblifjua, inflata, insequilaterali, postic^ obtusd angulata; valvulis subcra?sis, antice crassioribus ; 

 natibus prominentibus ; epidenuide tenebmso-fusca, polita obsolete radiata ; dentibus cardinalibus sub- 

 grandibus, obtuse coniciscrenulatisque; latcralibus cra?sis, ciirlis rectisque; uiargaritaalbaet iridesconte. 



Shell smooth, oblique, inflated, inequilateral, obtusely angular behind ; valves some- 

 what thick, thicker before ; beaks prominent ; epidermis dark brown, polished, ob- 

 scurely rayed ; cardinal teeth rather large, obtusely conical and crenulate ; lateral 

 teeth thick, short and straight ; nacre white and iridescent. 

 Proc. Acad. Nat. Sci. 1857, p. 85. 



Hah. — Catawba River, Gaston Co., N. C. ; Dr. Gcnth and C. M. Wheatley. Deep 

 River, Gulf, N. C. Prof. Emmons. 



My cabinet, and cabinets of Dr. Genth, JMr. Wheatley and Prof. Emmons. 

 Diam. -7, Length 1. Breadth 1-6 inch. 



Shell smooth, oblique, inflated, inequilateral, obtusely angular behind and rounded 

 before; substance of the shell somewhat thick, thicker before; ligament short, thick 

 and light brown ; epidermis dark brown, polished on the sides towards the beaks and 

 striate below; umbonial slope raised, obtusely angular; posterior slope wide and dark 

 brown ; cardinal teeth rather large, compressed, obtusely conical, crenulate and double 

 in both valves ; lateral teeth thick, short and straight; anterior cicatrices distinct, 

 rather large and well impressed; posterior cicatrices confluent, rather small and 

 slightly impressed; dorsal cicatrices placed near the centre of the cavity of the beaks 



17 



