Occasional Papers of the Museum of Zoology 31 



U. dilatatus Raf. = U. cuprea Raf., Conrad, '34, p. 68; Ferussac, '35, 

 p. 27. 



Unio producfus Con., '36, p. 31, pi. 14, f. i ; Simpson, '14, p. 690. 

 Elliptio cuprius, Ortmann, '19, p. no. 



The name Obliqu-aria cuprea is not preoccupied by Unio 

 fasciata cuprea Raf. (p. 294). Figure and description indi- 

 cate a long, elliptical shell, posteriorly attenuated, with cop- 

 per-colored nacre, found in the Monongahela and Potomac 

 rivers. 



This description (and the figure) might be applied to two 

 species : Ell. dilatatus found in the Monongahela, as done by 

 Conrad and Ferussac, and EU. productus found in the Poto- 

 mac. Thus, the name cuprea is not clearly defined, is not 

 valid and should not be used. 



If. under the rule laid down by Pilsbry in regard to crassi- 

 dcns. the first reviser has the right to designate which of the 

 several species represented in the composite species should 

 bear the original name, the action of Conrad (1. c.) in refer- 

 ring this species to dilafata would seem to be decisive. 



Eluptio RAFiNEsouEi (Vanatta), 19 15 



Type locality: lUack Creek, Florida. 



Unio fuscatiis Lea, '43, p. 11 (not L^ viridis fuscata Raf., '20, p. 

 294, nor. U. fragilis fuscata Raf.. '20, p. 295). 

 Unio fuscatus Lea, Simpson, '14, p. 643. 

 Unio rafinesquei Vanatta, '15, p. 559; Walker, '18^, p. 175. 



The change of the name introduced by Vanatta is justified, 

 fuscatus being preoccvipied in the genus Unio. 



Elliptio pusillus (Lea), 1840 



Type locality: Ogeechee River, Georgia. 



Unio pusillus Lea, '40, p. 386. 



Unio buxeus Lea, '52, p. 261, pi. 15, f. 13. 



Unio pusillus Lea, Simpson, '14. p. 611. 



Unio buxeus Lea ^ C/. pusillus Lea, Vanatta, '15, p. 555. 



U. pusillus Lea, Walker, '16^, p. 46; 'i8c, p. 175. 



