UPPER TENNESSEE DRAINAGE. 575 
Type locality: Cumberland River (not reported from the Cum- 
berland drainage by Wilson & Clark, ’14). 
Genus: Mepronipus Simpson (1900). 
Orunann, 120) p. 234-15, po 143: 
63. MEDIONIDUS PLATEOLUS (Rafinesque), 1831. 
Unio plateolus Rafinesque, ’31—Umnio conradicus Lewis, ’71.—Unio 
conradianus Pilsbry & Rhoads, ’96.—Medionidus conradicus Ort- 
mann, ’120, p. 335, and ’15, p. 142 (anatomy )—Medionidus con- 
radicus Ortmann, ’13), p. 311—Medionidus conradicus Good- 
rich, *13, p. 94.—Medionidus conradicus Simpson, ’14, p. 247. 
The identity of U. plateolus and conradicus Lea (’34) has been 
suggested to me by Frierson, and I think, this is correct. 
Very abundant in the headwaters and in small streams generally, 
but quite rare in the larger rivers. It has been found practically all 
over our region, and often goes up into the smallest streams which 
contain at all Nayades. It is hardly worth while to record single 
localities, and it suffices to say that it is in the Powell, Clinch, and 
Holston, and their tributaries; in the French Broad, it goes up to 
Asheville, N. Car.; it is in Little River, and in South Chickamauga 
Creek, Ga. From the Tennessee proper, below Knoxville, it has 
been reported by Lewis. 
Type locality: Falls of the Cumberland River. (Its existence at 
this place, below the falls, has been confirmed by Wilson & Clark, 
14.) 
Genus: Eurynta Rafinesque (1820). 
Ortmann, ’120, p. 336. 
64. Eurynia (MicroMYA) FABALIS (Lea), 1831. 
Unio fabalis Lea, ’31—Umnio fabalis Lewis, ’71.—Eurynia (Mi- 
cromya) fabalis Ortmann, 12), p. 339 (anatomy ).—Eurynia 
fabalis Goodrich, ’13, p. 94——Micromya fabalis Simpson, ’14, 
P- 33. 
Rather rare, but possibly in part overlooked. Lewis gives it 
from Tennessee River, below Knoxville, and the Walker collection 
