NEW UNIONIDiE OF THE UNITED STATES. :,:, 



Unio spadiceus. PI. 1, fig. 201. 



Testa la:vi, elliptica, subcouipressa, insequilaterali, posticd subbiangulata, subemarginata; valvulis subtenuibus, 

 antice crassioribus ; natibus vix prominulis; epiderinide spadicea, eradiata; deutibus cardinalibus 

 parvis crenulatisque; lateralibus sublongis subrectisque ; margarita salmonis colore tincta et iridescente. 



Shell smooth, elliptical, somewhat compressed, inequilateral, subbiangular behind, 

 subemarginate ; valves rather thin, thicker before; beaks scarcely prominent; epider- 

 mis reddish brown, without rays ; cardinal teeth small and crenulate ; lateral teeth 

 rather long and nearly straight; nacre salmon color and iridescent. 

 Proc. Acad. Nat. Sci. 1857, p. 86. 



Hob.— Deep River, Gulf, N. C, Prof. Emmons ; and mountain streams, N. C, Mr. 

 Joseph Clark. 



My cabinet, and cabinets of Prof. Emmons and Mr. Clark. 

 Diam - ' 4 > Length -7, Breadth 1-5 inch. 



Shell smooth, elliptical, somewhat compressed, inequilateral, subbiangular behind, 

 subemarginate at base; substance of the shell rather thin, thicker before; beaks 

 scarcely prominent; ligament short, thin and light brown; epidermis reddish brown, 

 without rays; umbonial slope slightly raised and obtusely angular; posterior slope 

 rather narrow, raised into a carina; cardinal teeth small, crenulate and double in 

 both valves; lateral teeth rather long and nearly straight; anterior cicatrices distinct, 

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

 impressed ; dorsal cicatrices placed across the cavity of the beaks ; cavity of the 

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

 salmon color and iridescent. 



Remarks. — I have only two specimens before me. The one figured is from my 

 friend the late Joseph Clark, to whom I am indebted for so many species and so much 

 information in this our favorite branch of zoology. The specimen is apparently 

 an adult. The exact habitat is not known. A half-grown one is from. Prof. 

 Emmons, and was taken in Deep River, N. C. In general character it is near to 

 fulvus, (nobis,) and reminds one of lanceolatus, (nobis,) but may easily be distin- 

 guished from both. 



Unio striatulus. PI. 2, fig. 202. 



Testa lifivi, triangulari, subinflata, subrcquilaterali, postic-0 angulata; valvulis subcrassis, antice crassioribus ; 

 natibus elevatis, acuminata, ad apices rugoso-uudulatis; epidermidc castanea, minute Btriata, obsolete" 

 radiata; dentibus cardinalibus parvulis. subconipressis, in utroque valvulo duplicibus crenulatisque; 

 lateralibus brevibus, subcrassis rectisque ; margarita vel alba vel croeea et iridescente. 



Shell smooth, triangular, somewhat inflated, nearly equilateral, angular behind; 

 valve? rather thick, thicker before; beaks elevated, acuminate, rugosely undulate at 

 the tips; epidermis chestnut brown, minutely striate, obscurely radiate; cardinal 



