﻿244 lMI..Si;KV(JCOXCllA 



The above is Conrad's description on the cover of the Mon- 

 ography, No. (). He gives "Rivers of Kentucky, from Mr. 

 John rhillips, who stateil that it was from the Ohio or a tribu- 

 tary below Louisville." No specimen so named can be found 

 in Conrad's collection, but Dr. Pilsbry found an unnamed 

 shell in the Conrad collection, which agrees very well with 

 the above description, which could not have come from Ken- 

 tucky, but which is undoubtedly a Pilsbryoconclui. 



PlI,Sl5RVOCONCHA I.15MESLE1 ( Morclct ) . 



Shell elongated, slightly wider behind and arcuate when 

 old, thin, shining ; somewhat compressed, especially posterior- 

 ly, with a low rounded posterior ridge ; anterior end rounded ; 

 posterior tmd with a rounded, somewhat narrowed point u 

 short distance above the base ; surface irregularly sulcate, 

 light brown, rayless ; area of the beaks extensively eroded in 

 the specimen figured, the eroded part being coppery-brown, 

 nacre bluish, iridescent with yellow-brown spots in the center 

 of the shell ; hinge edentulous. 



Length Si. hiMght 32, diam. 14 mm. 



Cambodia, probably near Battanibang, Siam. 

 Anodonta Icmcslci M(^RE;LE'^. Ser. Conch., I\'. 1875, p. 328. 



pi. XIV, fig. I. 

 Pilsbrxoconcha Icinslryi Simi'SON, Syn., 1900. p. 588. 



The type is an old, elongated, rather peculiar shell. Con- 

 rad's species may be the young of it. and Morelet believes that 

 Marten's A. schombnrgki is very close to his shell. I have 

 not seen a sufficient amount of material of this genus to 

 determine with certainty whether all these are valid species. 



Pir.si'-RvocoNCHA SCHOMBURGKI ( vou MartcuS). 



•'Shell elongate, narrow in front, expanded behind com- 

 pressed, thin ; epidermis shining, greenish ; dorsal margin near- 

 ly straight, elevated posteriorly into a low. rather long wing: 

 anterior and ]>osterior margins rounded, without distinct an- 

 r^les : ventral margin subconcave ; hinge distinctly edentulous ; 



