UPPER TENNESSEE DRAINAGE. 571 



Genus: Plagiola Rafinesque (1820). 

 Ortmann, '12b, p. 329. 



57. Plagiola lineolata (Rafinesque), 1820. 



Obliquaria lineolata Rafinesque, '20. — Unio securis Lewis, '71. — 

 Uiiio securis 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 



Ofl^utt, Anderson Co., Tenn. Rare. 

 Type locality: Falls of the Ohio. 



Genus: Paraptera Ortmann (1911). 

 Ortmann, '12b, p. 330. 



If the first species (leptodon) should actually belong here, the 

 generic name must be dropped in favor of Leptodea Rafinesque, '20 

 (see Frierson, '14a, p. 6). Utterback ('16, 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, 

 '16, p. 156. 



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. 



