UPPER TENNESSEE DRAINAGE. 527 
Wilson, Gy) Be andiG@lark, iis We. 
1914. The Mussels of the Cumberland River and its Tributaries. Bur. of 
Fisher., No. 781, 1914, pp. 1-63. 
Family: MARGARITANIDZ Ortmann (19114, p. 129). 
Genus: CUMBERLANDIA Ortmann (1912a, p. 13). 
I. CUMBERLANDIA MONODONTA (Say), 1829. 
Unio monodonta Say, ’29.—Unio monodontus Lewis, ’71—Marga- 
ritana monodonta Ortmann, 712), p. 233 (anatomy )—Marga- 
ritana monodonta Simpson, *14, p. 521. 
Widely distributed in the larger and medium rivers: Tennessee, 
Clinch, and Holston. According to Walker (’11), it goes up, in the 
Clinch, to Union Co., Tenn., but I found it also at Clinch River Sta- 
tion, Claiborne Co. In the Holston, I have traced it up to Austin 
Mill, Hawkins Co., Tenn. Walker gives it also from Little River, 
but this can be only in the lower part of it. 
This is generally regarded as a rare species; but in the lower 
Clinch, in Anderson Co., and in the lower Holston, in Knox Co., 
Tenn., it is locally abundant. 
Type locality: Falls of the Ohio. 
Family: UNIONIDZ Ortmann (19IIa, p. 129). 
Subfamily: UNIONIN Ortmann (1910, p. 116). 
Genus: FusconatA Simpson (1900). 
Ortmann (19120, p. 240). 
2. FUSCONAIA PILARIS (Lea), 1840. 
Unio pilaris Lea, ’40—Unio globatus Lea, ’71—Unio ebenus and 
pilaris Lewis, ’71 and ’72.—Unio pilaris Pilsbry & Rhoads, ’96.— 
Quadrula andrewst Marsh, ’02—Quadrula beauchampi Marsh, 
’02.—Quadrula pilaris, andrewsi, beauchampi, globata Simpson, 
"14, pp. 893-899. 
This is the upper Tennessee representative of F. subrotunda Lea 
of the Ohio drainage, and it may be merely a dwarfed, globular form 
