34 NEW UNIONID.E OF THE 



enough to display the character of the undulations, but there is enough to shew that 

 they are probably rather rugose. I have great pleasure in naming this beautiful 

 species in honor of my friend President Lindsley, of Nashville, who has done so much 

 to proniote a knowledge of the natural history of his State. 



Unio Lesleyi. pi. u8, fig. 177. 



Testil lajvi, obliqua. subcoinpressa, ad latere planulata, valdt^ lna3quilateraIi,posticu angulata, antice rotunda ; 

 valvulis crassis, antice crassioribus ; natibus subelevatis ; epidermide luteola, radiis interuptis ; dentibus 

 cardinalibus crassis, compressoconicis, obliquis ; lateralibus longis, crassis subcurvisque ; margarita 

 alba et iridescente. 

 Shell smooth, oblique, rather compressed,*flattened at the sides, very inequilateral, 

 angular behind and rounded before; valves thick, thicker before; beaks somewhat 

 elevated ; epidermis yellowish, with interupted ra3"s ; cardinal teeth thick, compressed- 

 conical, oblique ; lateral teeth long, thick and somewhat curved ; nacre white and 

 iridescent. 



Proc. Acad. Nat. Sci., 1860, p. 306. 



Hah. — Kentucky, Joseph Lesley; Tennessee, J. G. Anthony. 



My cal)inet and cabinet of Mr. Anthon3^ 

 Diam. 1, Length 1-7, Breadth 2-.S inches. 



Shell smooth, oblique, rather compressed, flattened at the sides and swollen towards 

 the beaks, very inequilateral, angular behind and rounded before ; substance of the 

 shell thick, thicker before ; beaks somewhat elevated, rather pointed and nearly 

 terminal ; ligament short, rather thick and light brown ; ejiidermis yellowish, with 

 interupted green rays on the sides and beaks, with rather distant lines of growth; 

 umbonial slope slightly raised ; posterior slope slightly raised, very oblique, with an 

 obscure "depressed line from the beak to the margin ; cardinal teeth thick, compressed- 

 conical, oblique, disposed to be double in both valves; lateral teeth long, thick, 

 somewhat curved ; anterior cicatrices distinct and deeply impressed ; posterior cica- 

 trices distinct and well impressed ; dorsal cicatrices under the plate and on the base 

 of the cardinal tooth ; cavity of the shell shallow and wide; cavity of the beaks 

 rather deep and angular; nacre white and iridescent. 



Remarlcs. — There are four specimens before me, but neither with perfect beaks. A 

 half grown one is nearly perfect, but not enough so to decide the character of the 

 undulations of the tips. This species belongs to the group of which davus, Lam., may 

 be considered the t3'pe. It is not so oblique as that species, but is much more com- 

 pressed and it more nearly resembles the patuhts (nobis) ; but may be distinguished 

 from that species by being more compressed, having the beaks less terminal and less 

 elevated, ^le rays like the rest of this group are green and liable to be interrupted 

 by the marks of growth. On the posterior slope of the two most perfect specimens 

 there are a few green spots. I owe the possession of this species with others to Mr. 

 Joseph Lesley, who captured it in Kentucky, and I name it after him. 



