﻿LAMPSILIS 87 



Close to /,. picta, and L. tceniata. I have only seen a few- 

 specimens of what are probably young shells of this species. 

 It is less elliptical than either of the other species, is more 

 rhomboid and smoother, the epidermis is a waxy, greenish-yel- 

 low. 



Lampsij^is punctata (Lea). 



Shell long obovate, generally solid, subinflated, with low, 

 not inflated beaks, whose sculpture is unknown ; posterior ridge 

 low and rounded, sometimes double and ending in a faint bian- 

 gulation ; posterior point about midway up from the base ; sur- 

 face covered with rather fine, irregular growth lines ; scarcely 

 shining, dirty greenish-yellow with numerous wide or narrow, 

 somewhat broken rays ; left valve with two nearly equal, small, 

 erect, slender pseudocardinals and two short laterals ; right 

 valve with one pseudocardinal, sometimes with a small one 

 above it; muscle scars well impressed; beak cavities shallow; 

 nacre white, dirty white or bluish, slightly thicker in front. 

 Both male and female shells are somewhat obovate and full 

 in the post-basal region, but the female is most produced at 

 that point. The shells are generally solid and inflated, but old 

 specimens are much more so. 



Length (male) 57, height 35, diam. 21 mm. 



Length (male) 76, height 50, diam. ^t^ mm. 



Length (female) 52, height 1,^, diam. 22 mm. 



Tennessee River drainage. 



Type locality, Caney Fork, Tenn., and Tuscumbia, Ala. 

 Unio punctatus Lea, Pr. Ac. N. Sci. Phila., IX, 1865, p. 89; 



Jl. Ac. N. Sci. Phila., VI, 1868, p. 261, pi. xxxii, fig. 76; 



Obs., XII, 1869, p. 21, pi. XXXII, fig. 76. 

 Margaron (Unio) punctatus Lea, Syn., 1870, p. 43. 

 Lampsilis punctatus Simpson, Syn., 1900, p. 542. 



Though evidently related to L. picta and its allies, this species 

 is quite distinct from all others. The shell is rather neat, the 

 nacre is thick to its edge, and the sides slope very rapidly to 

 the border. 



