4 University of Michigan 



The bibliographic references are brought down to January 

 I, 1922. 



FuscoNAiA EBENus (Lea), 183 1 



Type locality: Ohio River. 



Obovaria obovalis Rafinesque, '20, p. 311. 

 Unio ebenus Lea, '31, p. 84, pi. 9, f. 14. 

 Quadrula cbcna (Lea) Simpson, '14, p. 897. 



Quadrula obovalis (Raf.) = Q. ebenus (Lea), Vanatta, '15, p. 558 

 ("type" examined). 



Although the so-called (Rafinesque-Poulson) "type" of O. 

 obovalis Raf. has been identified as U. ebenus Lea, the orig- 

 inal description of the former can be applied to several spe- 

 cies {ebenus, subrotundus, and even to forms of the genus 

 Pleurobema, U. plenus for instance). Nothing is said of the 

 peculiar incurved beaks of ebenus and the deep beak cavities. 

 Thus, obovalis cannot be recognized from the original descrip- 

 tion, and ebenus Lea is valid. 



FuscoNAiA suBROTUNDA (Lea), 1831 

 Type locality: Ohio. 



Obliquaria sintoxia Rafinesque, '20, p. 310. 



Unio subrotundus Lea, '31, p. 117, pi. 18, f. 45. 



Obi. sintoxia Raf. = Obi. triangularis Raf., '20, Conrad, '34, p. 72 

 (the latter not identified; see also imder Pleurobema pyramldatum). 



Quadrula subrotunda (Lea) Simpson, '14, p. 892. 



Quadrula sintoxia (Raf.) = Q. subrotunda (Lea), Vanatta, '15, p, 

 558 ("type"' examined). 



Quadrula subrotunda (hea.) := Obi. sintoxia Raf., Walker, 'i6'", p. 

 46, and 'i8c, p. 169 ("if identifiable"). 



Fusconaia subrotunda (Lea) Ortmann, '19, p. 7. 



Vanatta says that Unio subrotundus Lea is preoccupied by 

 Obliquaria subrotunda Raf. '20; that this is not so has been 

 pointed out by Walker ('16^). 



Obi. sinto.ria Raf. cannot be recognized, in fact, according 

 to the measurements of the "type" given by Vanatta, it 



