﻿LAMTSILIS 185 



Length 105, height from broken point of wing 78, without 

 the wing ']2, diam. 38 mm. 



Alabama and Tombigbee River areas. 

 Type locaHty, Alabama River. 

 Symphynota inflata Lf,a, Tr. Am. Phila. Soc, IV, 183 1, p. 99,. 



pi. XIV, fig. 28; Obs., I, 1834. p. 109, pi. XIV, fig. 28. 

 Mctaptcra inflata Conrad, Pr. Ac. N. Sci. Phila., VI, 1853. p. 



260. 

 Margarita (Unio) in^atns Lea, Syn., 1836, p. 11 ; 1838, p. 13. 

 Unio iniiatus Conrad, Monog., VII, 1836, p. 57, pi. xxxii.— 

 Hani^uy, Biv. Shells, 1843, p. 174, pb xxi, fig. 45.— Kuster, 

 Conch. Cab. Unio, 1852, p. 17, pi. 11, fig. i.— Sowerby, Conch. 

 Icon., XVI, 1866, pi. xlv, fig. 246. 

 Margaron (Unio) inflattts Lea, Syn., 1852, p. 28; 1870. p. 28. 

 Unio alabamensis Conrad, New F. W. Shells, 1834, p. 67. 

 Lampsilis alabamensis Simpson, Syn., 1900, p. 574. 



Most nearly related to L. Unnssima, but it is not evenly 

 elliptical and it has a much higher posterior ridge than that 

 species. It has a decided anterior basal and posterior gape, the 

 latter in the specimen above measured being 7 millimeters 

 across. 



Lea originally described this species as Syniphynota inflata, 

 so that in Lampsilis his name is entitled to precedence, not- 

 withstanding Barnes' Unio inflatm described in 1823. 



Group of Lampsilis ainphicharna. 



Shell rather thin, elongate, elliptical, rounded before, pointed 

 behind, compressed, with a smooth, shining, black, rayless epi- 

 dermis ; beaks not prominent, their sculpture unknown ; there is 

 a conspicuous gape at the anterior base, and another very dis- 

 tinctly outlined at the upper part of the posterior end like that 

 of Schisothccrus; hinge line slightly curved ; pseudocardinals 

 imperfect; laterals compressed; nacre purplish; female shell 

 inflated at posterior base. 



