Occasional Papers of the Museum of Zoology 31 
U. dilatatus Raf.= U. cuprea Raf., Conrad, ’34, p. 68; Ferussac, ’35, 
pu27s 
Unio productus Con., ’36, p. 31, pl. 14, f. 1; Simpson, ’14, p. 690. 
Elliptio cuprius, Ortmann, ’I9, p. 110. 
The name Obliquaria 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 Férussac, and Ell. 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- 
dens, 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 dilatata would seem to be decisive. 
ELLIPTIO RAFINESQUEI (Vanatta), I915 
Type locality: Black Creek, Florida. 
Unio fuscatus Lea, 43, p. 11 (not U. viridis fuscata Raf., ’20, p. 
294, nor. U. fragilis fuscata Raf., ’20, p. 295). 
Umno 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 preoccupied in the genus Unio. 
ELLIPTIO PUSILLUS (Lea), 1840 
Type locality: Ogeechee River, Georgia. 
Unio pusillus Lea, ’40, p. 286. 
Unio busxeus Lea, ’52, p. 261, pl. 15, f. 13. 
Unio pusillus ea, Simpson, ’14, p. 611. 
Unio buxeus Lea = U. ‘pusillus Lea, Vanatta, ’15, p. 555. 
U. pusillus Lea, Walker, 16°, p. 46; ’18¢, p. 175. 
