UPPER TENNESSEE DRAINAGE. 5938 
Type locality: East Fork Stones River, Walterhill, Rutherford 
Co., Tenn. (cotypes examined). 
88. TRUNCILLA CAPSAFORMIS (Wea), 1834: 
Unio capseformis Lea, ’°34——Unio capseformis Lewis, ’71.—Trun- 
cilla florentina and capseformis Ortmann, ’12), p. 359 (anatomy). 
—Truncilla capseformis Ortmann, ’13), p. 311 —Truncilla cap- 
seformis Goodrich, ’13, p. 95.—Truncilla capsefornus Simpson, 
MiAn pe 20; 
The specimen of “ florentina,’ of which I have described the 
anatomy, was actually a capseformis. 
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. turgidula, florentina, 
walkeri, and capseformis, which will be discussed elsewhere. 
T. capseformis 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., 
Wenn; imgthe Clinch; to Cedar Bluit, Vazewell: Co., Vaz; ine 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: 
Unto apacus Haldeman (1824)—Holston River, Tenn. 
Pleurobema 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.) 
