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——Umnio gracilis Lewis, ’71.—Unio 
gracilis Pilsbry & Rhoads, ’96.—Paraptera gracilis Ortmann, ’120, 
p. 331 (anatomy).—Lampsilis (Proptera) gracilis Simpson, ’14, 
p. 181.—Leptodea (?) fragilis Frierson, ’14a, p. 7—Lampsilis 
fragilis Vanatta, ’15, p. 552—Lasmonos fragilis Utterback, ’16, 
Pp: aus 2s 
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: PRopreRA Rafinesque (1819). 
Ortmann, ’12), p. 332. 
60. PROPTERA ALATA (Say), 1817. 
Unio alatus Say, °17—Unio alatus Lewis, ’71—Unio alatus Pilsbry 
& Rhoads, ’96.—Proptera alata Ortmann, ’12), 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.—Carunculina Ortmann, 12), 
P.'3375) 14s 1p. Oe: 
To.xolasma Frierson, ’144, p. 7. 
