818 QUADRULA 
Unio bragesensis Lea, Pr. Ac. N. Sci. Phila., XII, 1868, p. 144; 
JL. Ac.“ N."Set.-Phila:. V1, 1660, p.- 3009 ply sci, sno oar 
Obs., XII, 1860, p. 69, pl. xLvui1, fig. 122. 
Margaron (Unio) brazosensis Lea, Syn., 1870, p. 31. 
Unio lincecumti Lea, Pr. Ac. N. Sci. Phila., XII, 1868, p. 144; 
Jl. Ac. -N. Sei Phila, VI 1860; p32) sple <i ie ee 
Obs., XII, 1860, p. 72, pl. x11x, fig. 125. 
Margaron (Unio) lincecumu Lea, Syn., 1870, p. 31. 
Unio lincecuru Pare.., Conch. Sam., II, 1890, p. 157. 
Umo pauciplicatus Lea, Pr. Ac. N. Sci. Phila., I], 1872, p. 
1565 0L Ac Ne Sei Phila, Vill 8745p. 20. ple renee 2 
©bs., SEM 8 74. 9:33, plaixe se. 2, 
This has.about an equal degree of inflation as Q. plicata, but 
as a rule its beaks are not so high, its outline is less rhom- 
boid, the ridges are stronger and cover more of the shell. 
They sometimes extend behind the posterior ridge and curve 
up to the hinder end of the dorsal slope. Generally it is a 
smoother, more shining shell than plicata and the nacre is 
more often tinted with purple. The Unio atrocostatus of Lea 
is a little shorter than the ordinary manifestation of the spe- 
cies, seeming to stand between it and elliottiu, but it hardly 
seems to me to be worth a.varietal name. U. brazosensts, 
pauciplicatus and lincecumti are merely forms more or less 
destitute of plications. 
Var. quintardu (Cragin). 
Shell with light brown, glossy epidermis; surface with a 
series of V-shaped ridges on the disk. 
Kansas. 
Type locality, Salt Creek, Sac and Fox Reservation, Okla- 
homa. 
Unio quintardu Cracrn, Bull. Wash. College, I, 1887, p. 6— 
Prispry) Pry Ac. IN. Set. Phila; 1892, p13. plow, tiess ise 
Quadrula perplicata var. quintardit SIMPSON, Syn., 1900, Pp. 
768. 
I do not think this form worthy of a specific name. It often 
happens that shells of other related species show decided traces 
of V-shaped sculpture. 
