302 NEW UNIONIDiE, MELANID^, ETC. 



Unio Pawensis. pi. 45, fi.s;;. 114. 



Testa Ijevi, suboblouga, inflata, valde inasquilaterali, postice subbiaugulari, antice rotundata ; valvulis 

 subcrassis ; natibus subprominentibus, subtumidis ; epidermide tenebroso-fusca, squamosa, 

 eradiata; dentibus cardiiialibus parvis, corrugatis, subconicis; lateralibus longis, lamellatis 

 subcurvisque ; margarita vel alba vel purpurescente et iridesceute. 



Shell smooth, suboblong inflated, very inequilateral, subbiangular behind and 

 rounded before; valves rather thick ; beaks somewhat prominent and rather swollen; 

 epidermis dark brown, squamose, without rays; cardinal teeth small, corrugate, 

 somewhat conical; lateral teeth lamellar and somewhat curved; nacre white or 



purplish and iridescent. 



Proc. Acad. Nat. Sci. 1868, p. 161. 



Bah.—Vixw Creek, Beaver Co., and Catawba Run, N. C, C. M. Wheatley. 



My cabinet and cabinet of Mr. Wheatley. 

 Diam. 1'2, Length 1-6, Breadth 29 inches. 



Shell smooth, suboblong, inflated, very inequilateral, subbiangular behind and 

 rounded before ; substance of the shell rather thick ; beaks somewhat prominent 

 and rather swollen ; ligament rather short, thin and dark brown ; epidermis dark 

 brown, squamose, without rays, with rather distant lines of growth ; umbonial 

 slope very much raised and obtusely angular; posterior slope wide, somewhat 

 carinate, with an impressed line from the beaks to the posterior margin; cardinal 

 teeth small, corrugate and somewhat conical ; lateral teeth lamellar and somewhat 

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

 confluent, large and slightly impressed ; dorsal cicatrices placed above the cavity 

 of the beaks; cavity of the shell deep and wide; cavity of the beaks rather deep 

 and wide; nacre white or purplish and iridescent. 



RemarJcs. — Quite a number of specimens were submitted to me by Mr. Wheatley, 

 none of which were perfect enough at the beaks to show any undulations, and all 

 were more or less eroded on the sides. In outline it is allied to squalidus (nobis), 

 and is nearest in general characters to that species. It also reminds one of ohesus 

 (nobis), but it is not so ventricose, and it differs in the epidermis, as well as the teeth. 



