UPPER TENNESSEE DRAINAGE. 527 



Wilson, C. B., and Clark, H. W. 



1914. The Mussels of the Cumberland River and its Tributaries. Bur. of 

 Fisher., No. 781, 1914, pp. 1-63. 



Family: MARGARITANID/E Ortmann (1911a, 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, 'i2h, 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: UNI0NID7E Ortmann (191 10, p. 129). 

 Subfamily: UNIONINtE Ortmann (1910, p. 116). 



Genus: Fusconaia Simpson (1900). 

 Ortmann (1912Z7, p. 240). 



2. Fusconaia pilaris (Lea), 1840. 



Unio pilaris Lea, '40. — Unio globatiis Lea, '71. — Unio ebenus and 

 pilaris Lewis, '71 and '72. — Unio pilaris Pilsbry & Rhoads, '96. — 

 Quadnda andrezvsi Marsh, '02. — Quadnda beauchampi Marsh, 

 '02. — Quadnda 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 



