DESCRIPTION OF FIFTY-TWO SPECIES OF UNIONID.E. 39 



cate, compressed, double in both valves; lateral teeth long, lamellar and nearly 

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

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

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

 and obtusely angular ; nacre pale salmon color or purple and very iridescent. 



Remarks. — Three specimens are before me by Mr. Wheatley's kindness. This 

 species is allied to virens and Catawhensis (nobis), more so in outline to the latter? 

 but it is rather wider and not so large a shell. It is not quite so flat on the sides 

 as Catawhensis. None of the specimens were perfect enough to display the charac- 

 ter of the undulations of the tips of the beaks. 



Unio amplus. pi. 13, fig. 36. 



Testa Isevi, oblonga, fere alata, inflata, insequilaterali, postice obtuse biangulata, antice rotundata ; 

 valvulis crassis, antice crassioribus ; natibus subpromineutibus ; epidermide rufo-fusca, nitida, 

 obsolete radiata, transverse vittata; dentibus eardinalibus parviusculis, rugosis, compressis; late- 

 ralibus prselongis lamellatisque ; margarita vel alba vel purpurea vel salmonis colore tincta et 

 valde iridescente. 



Shell smooth, oblong, almost winged, inflated, inequilateral, obtusely biangular 

 behind, rounded before ; valves thick, thicker before ; beaks somewhat prominent ; 

 epidermis reddish-brown, shining, obscurely radiate and transversely banded ; car- 

 dinal teeth rather small, rugose and compressed ; lateral teeth very long and lamel- 

 lar ; nacre white, purple or salmon colored and very iridescent. 

 Proc. Acad. Nat. Sci., 1812, p. 157. 



Jfa&.— Irwin's Creek, Mecklenberg Co., North Carolina, C. M. Wheatley. 



My cabinet and cabinet of C. M. Wheatley. 

 Diam. 1-3, Length 2, Breadth 3-6 inches. 



Shell smooth, oblong, almost winged, inflated, inequilateral, obtusely biangular 

 behind, rounded before ; substance of the shell thick, thicker before ; beaks some- 

 what prominent; ligament rather long and somewhat thin; epidermis reddish- 

 brown, shining, obscurely radiate and transversely banded, with rather distant 

 marks of growth; umbonial slope obtusely angular; posterior slope carinate, ellip- 

 tical, almost winged, with two slightly impressed lines from the beaks to the mar- 

 gin ; cardinal teeth rather small, rugose and compressed ; lateral teeth very long 

 and lamellar ; anterior cicatrices distinct, very large and well impressed ; posterior 

 cicatrices confluent, very large and moderately impressed ; dorsal cicatrices placed 

 above the centre of the cavity of the beaks ; nacre white, purple or salmon color. 



Remarks. — Among the North Carolina shells sent to me by Mr. Wheatley, were 

 four of this species. The largest of these is figured. The lines of growth are well 



