﻿I.AMPSILIS 147 



Length (male) 43, height 26, diam. 15 mm. 



Length (female) 35, heig'ht 22, diam. 13 nun. Possibly not 

 full grown. 



Type locality, Everglades, Florida. 

 Unio papyraccus Gould, Pr. Bost. Soc. N. Plist., 11, 1845, P- 



53. — Simpson, Pr. U. S. Nat. Mus.. XY, 1892, p. 427, pi. 



LXVIII, fig. 2. 

 Margaron (Unio) papyraccus Lea, Syn., 1852, p. 38; 1870, p. 



62^ 

 Lampsilis papyraccus Simpson, Syn., 1900, p. 562. 



A very fragile species, which appears to be allied to L. 

 amygdalum, but is thinner, more compressed and has a differ- 

 ent texture. 



Lampsilis singleyana (Marsh). 



Shell small, subsolid, long elliptical or slightly obovate, not 

 inflated ; beaks low, scarcely swollen, their sculpture not seen ; 

 surface with delicate, irregular growth lines, shining, a rich 

 tawny or tawny brown, sometimes darker banded ; left valve 

 with two low pseudocardinals, the hinder one a mere vestige, 

 and two feeble laterals ; right valve with one high, triangular, 

 compressed pseudocardinal and one lateral ; beak cavities shal 

 low, with two or three pits ; muscle scars well marked ; nacre 

 soft, silvery-tinted, flesh-color, and more or less iridescent 

 throughout, especially so behind. I have only seen a few spec- 

 imens of this pretty little shell, in which the male ends behind 

 in a rounded point at one-half to three-fifths of the distance 

 up from the base. The female shell has a rounded posterior 

 point two-thirds of the way up from the base, and a small, 

 rounded marsupial swelling at the extreme posterior part of 

 the base. 



Length 32, height 20, diam. 12 mm. 



Putnam and Volusia Counties, Florida. 



Type locality, Palatka, Fla. 

 Unio singlcyanus Marsh, Joliet Weekly News (a newspaper), 



Mav I, 1891 ; Nautilus, V, 1891, p. 20.— Simpson. Pr. LT. S. 



Nat. Mus., XV, 1892, p. 426, pi. Lxviii, figs. 4, 5. 

 lampsilis singlcyanus Simpson, Syn., 1900, p. 563. 



