﻿UNITED STATES AND NORTHERN MEXICO. 335 



striate; lateral teeth very long, lamellar and nearly straight ; nacre white, purplish 



or salmon color and very iridescent. 



Proc. Acad. Nat. Sci. 1859, p. 171. 



Hab. — Savannah River, near Savannah, Georgia. Rev. G. White and Major 

 Le Conte. 



My cabinet and cabinets of Mr. White and Major Le Conte. 

 Diam. "5, Length 1*1, Breadth 23 inches. 



Shell smooth, transverse, compressed, obtusely angular behind, rounded before and 

 very inequilateral ; substance of the shell rather thin, beaks slightly prominent ; 

 ligament rather thin and light brown ; epidermis yellowish or yellowish brown, 

 shining, with very distant marks of growth, and rayed over the whole disk ; umbonial 

 slope slightly raised and obtusely angular; posterior slope very long, narrow, sub- 

 carinate, striate, with two indistinct impressed lines on each valve from the beaks to 

 the posterior margin ; cardinal teeth small, rather compressed slightly raised, striate ; 

 lateral teeth very long, lamellar and nearly straight ; anterior cicatrices distinct and 

 moderately well impressed ; posterior cicatrices confluent and slightly impressed ; 

 dorsal cicatrices in a row situated across the centre of the cavity of the beaks ; cavity 

 of the shell shallow and wide ; cavity of the beaks very shallow and obtusely angular ; 

 nacre white, purplish, salmon color and very iridescent. 



Remarks. — I have four specimens of this species before me. None were received 

 with the soft parts. It belongs to the complanatus group, but is wider than that 

 species. It is not so wide as angustahis (nobis), and is more yellow and rayed. It 

 is also near to Duttonianus (nobis), but not nearly so wide. It is more carinate on 

 the posterior slope than either of the above named species. Like complanatus it 

 varies in the nacre. Of the four specimens before me, one is white, two are purplish 

 and one is salmon color. The marks of growth are very distinct, and the fine green 

 rays cover the whole disk. In the older ones the posterior slope becomes rugose with 

 strise and is dark brown. 



Unio verutus. PI. 53, fig. 160. 



Testa, Isevi, transversa, subinflata, ad latere planulata, postice obtuse angulata, antice rotundata et valde 

 inasquilaterali ; valvulis crassiusculis, antice paulisper crassioribus ; natibus prominulis, ad apices crebre 

 undulatis; epidennide rufo-fusca, radiata vel eradiata ; dentibus cardinalibus subgrandibus, compressis, 

 subelevatis, striatis, in utroque valvule- duplicibus; lateralibus prselongis, lamellatis, subcrassis subcur- 

 visque ; margarita, vel alba vel salmonia vel purpurasccnte et valde iridescente. 



Shell smooth, transverse, rather inflated, flattened at the side, obtusely angular 

 behind, rounded before and very inequilateral ; valves somewhat thick, slightly 

 thicker before ; beaks a little prominent, at the tips closely undulate ; epidermis red- 

 dish brown, sometimes radiate and sometimes without rays ; cardinal teeth rather 

 large, compressed, rather raised, striate and double in both valves; lateral teeth very 



