﻿94 I.AMI'SII.IS 



Unio viresccns Lea. I'r. Ac. N. Sci. Pliila., II, 1858. p. 40; Jl. 



Ac. N. Sci. Phila.. I\'. i860, p. 341. pi. i.v. fi<,^ 166; Obs., 



VIII, i860, p. 22,, pi. LV, fis- 166. 

 Margaron (Unio) 7-ircsccns Lra, Syn., 1870, p. 42. 

 Lampsilis lirescens Simpson, Syn., 1900, p. 544. 



This species seems to sliow affinities with members of the 

 luteola and 7rntricosa groups. Some specimens are apparently 

 close to L. anodontoides, but this species is much smaller, 

 higher in proportion to its length, and there is, apparently, not 

 so much difference between male and female shells. 



Lampsii.is AUSTiiAus Simpson. 



Shell elongate ovate or long elliptical, subinflated, subsolid, 

 with a low, rounded post-ridge ; beaks not high, the sculpture 

 not seen ; surface smooth, shining, with faint, irregular growth 

 lines, greenish-yellow with feeble rays, a considerable s^^ace 

 of the disk in the umbonal region is dark umber-color or 

 blackish ; left valve with two erect, somewhat compressed 

 pscTidocardinals, and two lamellar, slightly curved laterals ; 

 right valve with two pseudocardinals. the upper the smaller, 

 and one lateral ; beak cavities shallow ; muscle scars rather 

 shallow ; nacre bluish-white, not thickened anteriorly. The 

 type may be a young female. The two shells seen are rounded 

 in front and slightly full behind the middle at the base, and 

 pointed behind. 



Length (type) 52, height 2y, diam. 15 mm. 



Length (co-type) y2, height 38, diam. 24 ram. 



Type locality. Little Patsaliga Creek, southeastern Alabama. 

 L.ampsilis australis Simpson, Pr. Ac. N. Sci. Phila., 1900, 



p. 75, pi. II, fig. 2 ; Syn. 1900, p. 544. 



Only two specimens, the type and co-type, have been seen. 

 The figured type is a young, fairly healthy shell, the other 

 specimen is larger and has been injured probably by a Trem- 

 atod, as the teeth and cavity are brown or salmon-colored and 

 rough. The posterior end of this shell is slightly injured and 

 drawn down. Apparently a member of the anodontoides 

 group, and most nearly related to L. recta being nearly the 



