112 MEMOIRS OF THE CARNEGIE MUSEUM. 



with U. nasuta Say. Rafinesquc gives the Alonongahcla and Potomac Rivers as 

 habitats, but the first locahty apparently is an error. (On p. 294 Rafinesque de- 

 scribes a Unio fasciata cuprea, but this does not conflict with Obliquaria cuprea). 



This species is allied to the type of E. violaceus, but differs in its extreme 

 elongation and lanceolate shape. The subtrapezoidal outline is obscured, but at 

 least in young specimens is indicated by the presence of an angle between the 

 upper and the posterior margins. It is hardly possible to confuse this species 

 with E. violaceus, but it has a much closer resemblance to the following {E. fisheri- 

 anus), and has been mixed up with this by various writers. It is possible that 

 E. fisherianus is merely a variety of E. cupreus. There are other "species" in the 

 southern states, which group with this form, but they require further study. 



This shell (as well as E. fisherianus) has an outward resemblance to Eurynia 

 nasuta (Say), and was supposed to ])e nearly allied to it by the earlier authors, 

 but the anatomical structure is entirely different. 



Localities represented in the Carnegie Museum: 



Great Tonoloway Creek, Thompson Township, Fulton Co., Pennsylvania. 



Potomac River, Hancock, Washington Co., Maryland. 



South Branch Potomac River, Southbranch and Romney, Hampshire Co., West Virginia. 



Rappahannock River, Virginia (G. H. Clapp, donor). 



Marsh Run, Remington, Fauquier Co., Virginia. 



Mountain Run, Culpeper, Culpeper Co., Virginia. 



North River, Buena Vista and Lexington, Rockbridge Co., Virginia. 



Calf Pasture River, Goshen, Rockbridge Co., Virginia. 



Jackson River, Covington, Alleghany Co., Virginia. 



Locality represented in the Philadelphia Academy of Natural Sciences: 



Shenandoah River, Harpers Ferry, Jefferson Co., West Virginia (G. W. Tryon, Jr.). 



Distribution and Ecology (See fig. 11): Type-locality, Potomac River (Rafin- 

 esque). 



Conrad's Unio productus, which undoubtedly is this species, is given from 

 the Savannah River, Augusta, Richmond Co., Georgia. But Simpson (1900, p. 

 735) mentions only North Carolina, Virginia, and Maryland. But later (1914, 

 p. 691) he adds the type-locality. The southward range of this species as yet 

 remains obscure, and furthermore very few exact localities are on record. Besides 

 those given by myself, I know of only one which is reliable, that furnished by 

 Pilsbry (1894) from Sideling Creek, Allegany Co., Maryland.'^ 



"As I have suggested elsewhere (Ortmann, 1913rt, p. 320), Conrad's Unio lanceolatus (1846) from 

 the Upper James-drainage, is probably this species. 



