572 ORTMANN— NAYADES OF 



Type locality: Lower Ohio River (Vanatta says that the type is 

 from Kentucky River). 



59. Paraptera fragilis (Rafinesque), 1820. 



Unio fragilis Rafinesque, '20. — Unio gracilis Lewis, '71. — Unio 

 gracilis Pilsbry & Rhoads, '96. — Paraptera gracilis Ortniann, 'i2&^ 

 p. 331 (anatomy). — Lampsilis (Proptera) gracilis Simpson, '14, 

 p. 181. — Leptodca {?) fragilis Frierson, '14a, p. 7. — Lampsilis 

 fragilis Vanatta, '15, p. 552. — Lasmonos fragilis Utterback, '16, 

 p. 152. 



In the larger rivers, not rare. Tennessee River, below Knox- 

 ville (Lewis) and Holston River, Boyd Island, near Knoxville 

 (Pilsbry & Rhoads). In the lower Nolichucky at Chunn's Shoals, 

 Hamblen Co. ; up the Holston to Holston Station, Grainger Co. ; in 

 the Clinch up to Clinch River Station, Claiborne Co. ; in the Powell 

 River, up to Combs, Claiborne Co., Tenn. 



Type locality: Ohio River (the type is, according to Vanatta, 

 from creeks in Kentucky). 



Genus: Proptera Rafinesque (1819). 

 Ortmann, '12&, p. 332. 



60. Proptera alata (Say), 1817. 



Unio alatus Say, '17. — Unio alatns Lewis, '71. — Unio alatus Pilsbry 



& Rhoads, '96. — Proptera alata Ortmann, '12b, p. 333 (anatomy). 



— Lampsilis (Proptera) alata Simpson, '14, p. 162. 



Common in the larger rivers : Tennessee in Knox Co. ; goes up 

 the Clinch to Clinchport, Scott Co., Va. ; up the Powell, to Combs, 

 Claiborne Co., Tenn. ; it reaches the North Fork Holston at its 

 mouth, at Rotherwood, Hawkins Co., Tenn. It is also in French 

 Broad River, and in the lower part of the Nolichucky at Chunn's 

 Shoals, Hamblen Co., Tenn. 



Type locality: ? 



Genus: Toxolasma Rafinesque (1831). 



Corunculina (error typ.) Simpson, '98. — Carnncnlina Ortmann, '12&, 

 p. 337; '14, p. 68. — Toxolasnia Frierson, '140, p. 7. 



