﻿80 NEW UNIONIDJ5 OF THE 



Embryonic shell elongate, pouch-shape ; color clear white. 



Remarks. — A number of specimens of this rather small and pretty species I owe 

 the possession of to Bishop Elliott and Mr. Clark. It is near to intercedens, (nobis,) 

 and Nashvillianus (nobis,) and belongs to the group of which the latter may be con- 

 sidered the type. There are usually two lines of growth, both strongly marked, the 

 superior one the more so. The nacre is usually purplish, but sometimes white, more 

 often purple mixed with salmon color. The female form is very obtuse at posterior 

 end and much inflated. 



Unio virens. PI. 16, fig. 60. 



Testa laevi, oblonga, subinflata, postice obtuse angulata, valde inequilaterali • valvulis subcrassis, antice cras- 

 sioribus; natibus parvis, prominulis; epidermide virido-oliva, striata, vitatta, obsolete radiata ; dentibus 

 cardinalibus parvis. erectis, subcompressis crermlatisque ; lateralibus prselongis, lamellatis rectisque; 

 margarita coeruelo-alba et iridescente. 



Shell smooth, oblong, somewhat inflated, obtusely angular behind, inequilateral ; 

 valves rather thick, thicker before ; beaks small, a little prominent ; epidermis green- 

 ish olive, striate, banded, obsoletely rayed ; cardinal teeth small, erect, rather com- 

 pressed and crenulate ; lateral teeth very long, lamellar and straight ; nacre bluish 

 white and iridescent. 



Proc. Acad. Nat. Sci., 1857, p. 169. 

 Hab. — Georgia. Rev. G. "White. 

 My cabinet and cabinet of Mr. White. 

 Diam. '9, Length 1*3, Breadth 2-7 inches. 



Shell smooth, oblong, somewhat inflated, obtusely angular behind and obliquely 

 rounded before ; substance of the shell somewhat thick, thicker before ; beaks small, 

 a little prominent, wide ; ligament rather long and thin ; epidermis greenish olive, 

 shining on the upper portion and roughly striate towards the margin, with very 

 obscure rays, with very distant and strongly marked lines of growth ; umbonial 

 slope long and subangular ; cardinal teeth small, erect, rather compressed, crenu- 

 late, single in the right and double in the left valve ; lateral teeth very long, lamel- 

 lar, straight and somewhat enlarged at posterior end ; anterior cicatrices distinct, 

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

 cicatrices small, and placed under the plate posterior to the cardinal tooth ; cavity 

 of the shell wide and rather shallow; cavity of the beaks very shallow and rounded; 

 nacre white and iridescent. 



Remarks. — I have only received from Mr. White one whole specimen and an odd 

 left valve of this species. It belongs to the complanatus group, and resembles the 

 wide white variety. It inclines very much to the form and appearance of buxeiis, 

 (nobis,) from South Carolina. It is longer than that species, and is not so shining 

 or brown. In outline and obliqueness it reminds one of Tuomeyi (nobis.) The 



