UPPER TENNESSEE DRAINAGE. 563 



44. Strophitus EDENTULUS (Say), 1829. 



Alasmodonta edentula Say, '29. — Anodonta edentula Lewis, '72. — 

 Alasinodonta edentula Pilsbry & Rhoads ,'96. — Strophitus eden- 

 tidus Ortmann, 'i2h, p. 299 (anatomy). — Strophitus edentulus 

 Ortmann, '13&, p. 311. — Strophitus edentulus Goodrich, '13, p. 

 94. — Strophitus edentulus Simpson, '14, p. 345. 

 Walker thinks that the upper Tennessee-form might be distin- 

 guished from the normal edentulus as var. shaefferiamis (Lea). He 

 believes that the latter is more compressed and more projecting an- 

 teriorly, and has more frequently reddish nacre. In the average, this 

 appears to be correct, yet there are many specimens in my rich mate- 

 rial which do not exhibit these characters, and cannot be distin- 

 guished from specimens of the normal edentulus, as found, for in- 

 stance, in western Pennsylvania. Thus I do not think it advisable 

 to separate the two forms. 



This species is abundant, both in larger rivers and smaller 

 streams : in the Tennessee, in the lower French Board, the Holston 

 and its forks and tributaries, and all over the Clinch and Powell 

 drainages. It goes up, in the Powell, to Big Stone Gap, Wise Co., 

 Va. ; in the Clinch to Cedar Bluff, Tazewell Co., Va. ; in the Forks of 

 the Holston, to Saltville, Smyth Co., Va., and Bluff City, Sullivan 

 Co., Tenn. 



It has not been found by myself in the eastern tributaries of the 

 Tennessee south of the French Broad, but possibly this is accidental. 

 Type locality: Wabash River. 



Subfamily: LAMPSILIN.E Ortmann, 1910. 

 Ortmann, '10, p. 118. 



Genus: Ellipsaria Rafinesque (1820). 



Ptychobranchus Simpson, '00. — Ortmann, 12b, p. 305. — Ellipsaria 

 Frierson, '14a, p. 7. 



45. Ellipsaria fasciolaris (Rafinesque), 1820. 



Obliquaria fasciolaris Rafinesque, '20. — Unio phaseolus Lewis, '71. 

 — Unio phaseolus Pisbry & Rhoads, '96. — Ptychobranchus 



