UPPER TENNESSEE. DRAINAGE. 571 
Genus: PLAGIoLA Rafinesque (1820). 
Ortmann, 120, p. 329. 
57. PLAGIOLA LINEOLATA (Rafinesque), 1820. 
Obliquaria lineolata Rafinesque, ’20.—Unio securis Lewis, ’71.— 
Unio securts Pilsbry & Rhoads, ’96.—Plagiola securis Ortmann, 
*12b, p. 329 (anatomy).—Plagiola (Plagiola) securis Simpson, 
"14, p. 304.—Plagiola lineolata Vanatta, °15, p. 553.—Plagiola 
securis Walker, ’16, p. 45. 
Of the names of Rafinesque (depressa, lineolata, and ellipsaria) 
given to this species, lineolata has been selected by Conrad in 1834. 
(Walker, 1. c.) This name has been used also by Say, Agassiz, and 
Call. 
Only in the larger rivers. Tennessee at and below Knoxville, 
also at Rathburn, Hamilton Co., Tenn. (Walker collection). In the 
Clinch at Patton’s Ferry, Roane Co. (Pilsbry &-Rhoads), and at 
Offutt, Anderson 'Co., Tenn. Rare. 
Type locality: Falls of the Ohio. 
Genus: PARAPTERA Ortmann (IQITI). 
Ortmann, 7120, p. 330. 
If the first species (leptodon) should actually belong here, the 
generic name must be dropped in favor of Leptodea Rafinesqtie, ’20 
(see Frierson, ’14a, p. 6). Utterback (716, p. 151) uses Lasmonos 
Raf. 
58. PARAPTERA LEPTODON (Rafinesque), 1820. 
Unio leptodon Rafinesque, ’20.—Unio tenuissimus Lewis, ’71.— 
Lampsilis (Proptera) leptodon Simpson, 14, p. 188.—Lampsilis 
leptodon Vanatta, 15, p. 551.—Lasmosos leptodon Utterback, 
210, ps di50: 
A rare shell. Lewis gives it from the Tennessee below Knoxville. 
In the Walker collection it is from the Clinch, at Needham Ford, 
Union Co., Tenn., and I found it in the Clinch at Edgemoor, Ander- 
son Co., Tenn. I found it also in the Holston at Holston Station 
and Noeton, Grainger Co., Tenn. 
