46 THE NAUTILUS. 



Cyprogenia irrorata (Lea). 



Obovaria stegaria tuberculata Raf. is not preoccupied by 

 Obliquaria tuberculata Raf. But Obovaria striata tuberculata has 

 page precedence. If identifiable, stegaria Raf. (1820) has 

 priority over irrorata Lea (1830) as the specific name. 



Unio gibbosus Bar. 



Barnes' name (1823) is not preoccupied by Amblema gibbosa 

 Raf. (1820). But Unio dilatata Raf. (1820), if identifiable, 

 has priority. 



Unio pusillus Lea. 



Obliquaria pusilla Raf. (1820) did not prevent the use of 

 of pusillus for a Unio by Lea in 1840. Lea's name will, there- 

 fore, stand. 



Quadrula lachrymosa (Lea). 



Simpson did not separate asperrima Lea varietally from 

 lachrymosa as Vanatta's remark would indicate. If identifiable, 

 Rafinesque's name, quadrula, has priority and would become 

 the specific name and, if separable varietally, lachrymosa Lea 

 would become a variety. 



Quadrula pustu losa ( Lea ) . 



Obliquaria retusa Raf. (1820) is not preoccupied by Unio 

 retusa Lam. (1819). If identifiable, Rafinesque's name would 

 have priority over Lea's. 



Quadrula subrotunda (Lea). 



Unio subrotunda Lea (1831) is not preoccupied by Obliquaria 

 subrotunda Raf. (1820). However, sintoxia Raf. (1820), if 

 identifiable, has precedence over subrotunda Lea. 



The statement that " many of Rafinesque's species have been 

 credited to Conrad by Mr. C. T. Simpson " is hardly fair to the 

 latter. Conrad did sufficiently describe and figure a consider- 

 able number of species in his " Monography " of 1836, which 

 he credited to Rafinesque. At least one of these, U. cordatus, 

 does not agree with the specimen under that name in the Poul- 

 son collection as identified by Vanatla. Simpson states ex- 

 pressly that he had made careful and repeated attempts to 

 identify Rafinesque's species and that, while he found quite a 

 number that should be recognized and which he did recognize, 

 as to the remainder he was "utterly unable to make anything 



