UPPER TENNESSEE DRAINAGE. 693 



Type locality: East Fork Stones River, Walterhill, Rutherford 

 Co., Tenn. (cotypes examined). 



88. Truxcilla caps^eformis (Lea), 1834. 



Uiiio capsceforniis Lea, '34.- — Unio capsarfonnis Lewis, '71. — Trun- 

 cilla florentina and capscuformis Ortmann, '12/7^ p. 359 (anatomy). 

 — Truncilla capsceforniis Ortmann, '13&, p. 311. — Triincilla cap- 

 sceforniis Goodrich, '13, p. 95. — Truncilla capsceforniis Simpson, 

 '14, p. 29. 



The specimen of ''florentina," of which I have described the 

 anatomy, was actually a capsceforniis. 



Distinguished from the two preceding species by the combina- 

 tion of the following characters : shell rather compressed, with the 

 beaks not much elevated; expansion of the female uniformly dark 

 green, with only small, few, and remote denticles on the margin. 



There are differences in the soft parts of T. turgidnla, florentina, 

 zvalkeri, and capsceforniis, which will be discussed elsewhere. 



T. capsceforniis is very abundant in the upper Tennessee drain- 

 age, all over the region. It is in the Tennessee below Knoxville, in 

 Powell, Clinch, Holston, Nolichucky, Little Pigeon, and goes up, in 

 the French Broad, to Asheville, N. Car. (Walker coll.). It is also 

 in Little Tennessee, at Coytee, Loudon Co., Tenn. (Walker coll.). 

 In the Powell, it has been traced up to Shawanee, Claiborne Co., 

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

 North Fork Holston, to Mendota, Washington Co., Va. (also in 

 Big Mocassin Creek) ; in the South Fork Holston, it is at Pactolus, 

 Sullivan Co., Tenn., but not farther up. 



Type locality: Cumberland River. 



The above enumeration contains nearly all nominal species ever 

 recorded from the upper Tennessee region. However, there are yet 

 two additional ones, which have not been mentioned : 



Unio abacus Haldeman (1824) — Holston River, Tenn. 

 Plcnrohema abacus Simpson, '14, p. 810. 



A spurious species, which never has been positively recognized. 

 Specimens under this name in the Lea collection (U. S. Nat. Mus.) 



