260 NEW UNIONID^, MELANIDiE, ETC., 



cardinal teeth rather large, somewhat compressed and corrugate ; lateral teeth thick, 

 oblique and somewhat curved ; nacre pale salmon and very iridescent. 

 Proc. Acad. Nat. Sci. 1865, p. 89. 



Flub. — East Tennessee, Major S. S. Lyon, U. S. E. 



My cabinet. 

 Diam. '8, • Length 1'5, Breadth TS inch. 



Shell smooth, subrotund, somewhat compressed, inequilateral ; substance of the 

 shell somewhat thick, thicker before; beaks prominent; ligament rather short, thick 

 and light brown ; epidermis reddish-brown, with dark broad rays over the middle of 

 the valves and with distant marks of growth ; urabonial slope flattish ; posterior 

 slope narrow and very slightly carinate ; cardinal teeth rather large, somewhat com- 

 pressed and corrugate; lateral teeth thick, oblique, somewhat curved and corrugate; 

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

 confluent, rather small and impressed ; dorsal cicatrices placed over the centre of the 

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

 shallow and obtusely angular ; nacre pale salmon and very iridescent. 



Remarhs. — A single specimen only was received from Major Lyon. The exact 

 habitat not mentioned, but I presume it came from near Cumberland Gap. In 

 outline it is near to Leseuerianus (nobis), but it is not quite so rotund. It is a more 

 compressed species, differs in color of the epidermis and in the rays. It also 

 resembles _2Jitc?icr<.s (nobis), but that shell in a perfect state is triangular and thinner. 

 The rays are somewhat like those of Ilolstonensis (nobis). The nacre of the 

 specimen before me is very fine, and the salmon tint very agreeable. It is likely 

 that specimens may be found to be white. I have great pleasure in dedicating the 

 species to Major Lyon, late of the Engineer Corps U. S. Army, to whom I am 

 indebted for many species of molluscs from the western waters. 



Unio doliaris. pi. 32, fig. 75. 



Testa Isevi, elliptica, valde inflata, inoequilaterali, postice obtuse angulata, antice rotuaidata ; valvulis 

 subtenuibus, antice crassioribus ; natibus prominentibus, valde inflatus ; epidermide viridi-lutea, 

 radiis undique indutis ; dentibus cardinalibus erectis, acuniinatis, compresso-conicis crenulatisque ; 

 lateralibus sublongis, curvatis, lamellatis corrugatisque ; margarita alba et valde iridescente. 



Shell smooth, elliptical, very much inflated, inequilateral, obtusely angular behind, 

 rounded before; valves rather thin, thicker before; beaks prominent, very much 

 inflated; epidermis greenish-yellow, covered all over with rays ; cardinal teeth erect, 

 pointed, compressed conical and crenulate ; lateral teeth rather long, lamellar, curved 

 and corrugate ; nacre white and very iridescent. 

 Proc. Acad. Nat. Sci. 1865, p. 89. 



