UPPER TENNESSEE DRAINAGE. 535 
Simpson, ’14, pp. 754, 755, 790, 791.—Fusconaia barnesiana Ort- 
Miann, 217... 50: 
Simpson, ’14, p. 754, makes tellicoense a synonym of barnesianum, 
and (p. 755) lyonit a synonym of pudicum. 
U. pudicus is practically the same as barnesianus, but with dis- 
tinct rays; mereditht is a pudicus with only few rays; U. lyoni is 
large and has rays; it also has somewhat elevated beaks, inclining 
thus toward the var. twmescens; tellicoensis and lenticularis are mod- 
erately large, with indistinct rays, practically identical with bar- 
nesianus. 
This form, which we must regard as the typical species, unfor- 
tunately represents the intermediate condition between the flat and 
swollen extremes. It is represented by shells from the Powell, 
Clinch, and Holston, going up here well toward the headwaters: in 
Powell to Big Stone Gap, Wise Co., Va.; in the Clinch to Richland, 
Tazewell Co., Va.; in the Holston to the North Fork at Holston, 
Washington Co., Va., and to the South Fork at Bluff City, Sullivan 
Co., Tenn. In the downstream direction, it can be traced to the 
Tennessee River below Knoxville. However, it is most abundant in 
lower Powell, in the middle Clinch, and in the Holston near the 
Forks. In addition, it turns up in many tributaries: Cove Creek, 
Campbell Co., Tenn.; Coal Creek, Anderson Co., Tenn.; Big Flat 
Creek, Knox Co.; in Little Pigeon River, Boyd Creek, Pistol Creek, 
Tellico River, Cane Creek (McMinn Co.), Hiwassee River, etc. 
It is a common form, of rather universal distribution under the 
proper conditions. Toward the headwaters, it passes generally into 
the var. bigbyensis, but there are some small creeks where this is 
not the case (at any rate, where the bigbensis-form has not been 
found). In the larger rivers it gradually passes into the form 
tumescens, and is often found associated with it. 
Type locality: Cumberland River, Tenn. (not found by Wilson 
and Clark, ’14, although they mention “Fleurobema crudum” 
= barnesiana tumescens; the latter, however, surely has been mis- 
identified ). 
