﻿74 I.AMISIMS 



vvitli two ociual, delicate pseiulocartliiials and two curved, 

 lamellar laterals ; ri^ht valve wiUi two pscudocardinals, tiie 

 lower the larger, and one lateral ; beak cavities not deej) ; nacre 

 bluish, white or salmon-tinted, brilliant, scarcely thickened in 

 fn)nt. The male shell is somewhat oblong', and is not narrowed 

 at the anterior or posterior ends, the hinder end rounded and 

 scarcely "pointed ; the female shell is somewhat rounded behind 

 and has an evenly curved marsupial swellinj^-. 



Length (male) 53, heig-ht 7^2, (Ham. 18 mm. 



Len,q:th (male) 58, height 35. diam. 22 mm. 



Length (female) 50. height 7,t^, diam. 21 mm. 



Llanos, Guadalupe, and Colorado Rivers, Texas. 



Type locality. Llanos River, Texas. 

 Unio bracteatiAS Gouu), Pr. Host. Soc. N. Hist., V, 1855, p. 



288. 

 Margaron (Unio) bracteatus Lka, Syn., 1870, p. 43. 

 Lampsilis bracteatus Simpson, Syn.. 1900. p. 543. 



I had only seen a single specimen of this species when the 

 v^ynopsis was written, a male shell presented to Dr. Lea by 

 Dr. Gould, and T was inclined to believe that it was a rather 

 delicate meml)er of the ligamentina group. A considerable 

 amount of material received since then including a number of 

 female shells leads me to believe that it belongs nearer to L. 

 poweUii and recviana. It is a shorter shell than either of these, 

 and the male is more evenly oblong. 



Lampsims ueeviana (LeaV 



Shell subsoHd, but cpiite thin and inclined to crack at the 

 edges, long, elliptical or long obovate, only moderately inflated ; 

 beaks not high or full, their sculpture not seen ; surface smooth 

 and shining, yellowish-green or greenish-yellow, with numer- 

 ous broken, wavy green rays. These rays are often wide and 

 narrow alternately and are so broken as to have occasional 

 concentric bands of the lighter color ; hinge with small and 

 sometimes imperfectly developed pseudocardinals, two in the 

 left valve and one in the right ; laterals small and short, remote 

 from pseudocardinals and separated from them by a nar- 



