558 ORTMANN— NAYADES OF 



Big Creek, Hawkins Co., Tenn. (to Holston) ; Long Creek, Cocke 

 Co., Tenn. (to French Broad) ; Little Pigeon River, Sevier Co., 

 Tenn. (to French Broad) ;, First Creek and Third Creek, Knox Co., 

 Tenn. (to Tennessee) ; Piney River, Rhea Co., Tenn. (to Ten- 

 nessee) ; Conasauga Creek, Monroe Co., Tenn. (to Hiwassee) ; 

 South Chickamauga Creek, Catoosa Co., Ga. (to Tennessee). 



Thus this species has practically a universal distribution in our 

 region, but it strictly avoids larger streams. 



Type locality: Small streams of the Knobs, Kentucky (head- 

 waters region of Cumberland and Kentucky Rivers). 



37. Lasmigona (Lasmigona) costata (Rafinesque), 1820. 



Alasmidonta costata Rafinesque, '20. — Margaritana rugosa Lewis, 

 '71. — Alasmodonta rugosa Pilsbry & Rhoads, '98. — Symphynota 

 costata Ortmann, 'i2h, p. 283 (anatomy). — Symphynota costata 

 Ortmann, '13&, p. 311. — Symphynota costata Goodrich, '13, p. 94. 

 — Symphynota {Lasmigona) costata Simpson, '14, p. 488. 

 A common species, most abundant in small and medium-sized 

 streams, rarer in the larger rivers, but not absent there (Tennessee, 

 lower Clinch and Holston). Goes up, in the Powell, to dinger, Lee 

 Co., Va. ; in the Clinch, to Cedar Bluff, Tazewell Co., Va. ; it is in 

 Emory River ; goes, in North Fork Holston, to Saltville, Smyth Co., 

 Va. ; in Middle Fork Holston, to Chilhowie, Smyth Co., Va. ; in 

 South Fork Holston, to Barron, Washington Co., Va. ; in Watauga, 

 to Johnson City, Washington Co., Tenn. It is also in South Chicka- 

 mauga Creek, Ringgold, Catoosa Co., Ga. 

 Type locality: Kentucky River. 



Genus: Anodonta Lamarck (1799). 

 Ortmann, '12&, p. 286. 



38. Anodonta grandis gigantea (Lea), 1834. 



Anodonta gigantea Lea, '34. — Anodonta grandis (incl. gigantea) 

 Ortmann, '12/7, p. 292 (anatomy). — Anodonta grandis gigantea 

 Simpson, '14, p. 420. 

 No Anodonta has ever been reported from the upper Tennessee 



