564 ORTMANN— NAYADES OF 



phaseoliis Ortmann, '12&, p. 306 (anatomy). — PtycJiobranchus 

 phaseolus Goodrich, '13, p. 94. — Ptychobranchus phaseoliis Simp- 

 son, '14, p. 333. — Ellipsaria fasciolaris Frierson, '140^ p. 7. — 

 Ptychobranchus fasciolaris Vanatta, '15, p. 554. 



Widely and uniformly distributed over the upper Tennessee 

 region, but nowhere in great numbers. In the Tennessee, French 

 Broad, Holston, Clinch, lower Emory, and Powell. It goes up, in 

 the Powell, to Pennington Gap, Lee Co., Va. ; in the Clinch, to Cleve- 

 land, Russell Co., Va. ; in North Fork Holston, to Alendota, Wash- 

 ington Co., Va. ; in South Fork Holston, to Emmett, Sullivan Co., 

 Tenn. It is one of the species which has been reported from French 

 Broad River, at Asheville, Buncombe Co., N. Car. It has not yet 

 been found in Little River, Little Tennessee, and Hiwassee, but it 

 is in South Chickamauga Creek, at Ringgold, Catoosa Co., Ga. 



Type locality: "Ohio, Wabash, Kentucky rivers." (The type is 

 from Kentucky River, according to Vanatta.) 



46. Ellipsaria subtenta (Say), 1825. 



Unio subtcntus Say, '25. — Unio snhtcntns Lewis, '71. — Unio siib- 

 tentus Pilsbry & Rhoads, '96. — PtycJiobrancJms subtentus Ort- 

 mann, '12b, p. 308 (anatomy). — Ptychobranchus subtentus Ort- 

 mann, '13&, p. 311. — PtychobrancJius subtentus Goodrich, '13, p. 

 94. — Ptychobranchus subtentum Simpson, '14, p. 339. 



Known from Tennessee, Powell, Clinch, Holston, and Nolichucky 

 rivers, but more abundant toward the headwaters, and rather rare 

 in the big rivers. Goes up to Big Stone Gap, Wise Co., Va. ; to 

 Cedar Bluff, Tazewell Co., Va. ; and to Smyth Co., Va. (in North 

 and Middle Fork Holston). Also in Big Mocassin Creek, in Scott 

 Co., Va. Thus it ascends, in the small streams, father than E. 

 fasciolaris. In the headwaters it is locally quite abundant. 



Type locality: North Fork Holston River (Say says in South 

 Carolina, but this is in Virginia) (topotypes examined). 



Genus: Obliquaria Rafinesque (1820). 

 Ortmann, '12b, p. 309. 



