574 ORTMANN— NAYADES OF 



man, Roane Co., Tenn. ; North Fork Holston River, at Saltville, 

 Smyth Co. (O. A. Peterson), and at Holston, Washington Co., Va. 

 (Walker coll.); Holston Bridge, Scott Co., Va. (Walker coll.); 

 Holston River, Rogersville (= Austin Mill), Hawkins Co., Tenn. 

 (Walker coll.) ; Little Pigeon River, Sevierville, Sevier Co., Tenn.; 

 Pistol Creek, Rockford, Blount Co., Tenn. In addition, it is in 

 Lewis's list from the Tennessee below Knoxville. 



Type locality: Rockcastle River, Ky. Its actual presence in Rock- 

 castle River, at Livingston, Rockcastle Co., Ky., has recently been 

 confirmed by Williamson (as U. glans, see: Ohio Naturalist, 5, 1905, 

 p. 311). Wilson & Clark, '14, do not give it from this place, but I 

 have seen specimens in the Walker coll. from this locality. 



Note: This form is also present in the tributaries of the Ten- 

 nessee in North Alabama, as has been indicated long ago by Conrad. 

 It also seems to be represented in the Alabama drainage, but from 

 this region it generally goes under the name of corviinculus Lea, '68. 

 I have a number of specimens of the latter before me, which I cannot 

 distinguish from the upper Tennessee form. 



Genus: Lemiox Rafinesque (1881). 

 Frierson, '14a, p. 7. — Ortmann, '16, p. 39. 



62. Lemiox rimosus (Rafinesque), 1831. 



Unio rimosus Rafinesque, '31. — Uiiio caiatits Lewis, '71. — Micromya 

 ccclata Goodrich, '13, p. 94. — Micromya ccclata Simpson, '14, p. 

 34. — Lemiox rimosus Frierson, '14a, p. 7. — Lemiox ^rimosus Ort- 

 mann, '16, p. 39 (anatomy). 



This species has been reported from the Tennessee below Knox- 

 ville (Lewis), and from Powell, Clinch, and Holston rivers (Call). 

 It seems to have a wide distribution, but it is found nowhere in 

 great numbers, and is thus a rare shell. In the Powell, it goes up to 

 Jonesville, Lee Co., Va. ; in the Clinch, to St. Paul, Wise Co., Va. ; 

 in the North Fork Holston, to Holston, Washington Co., Va. It is 

 found here and there in the Holston proper and the lower Clinch, 

 but I have never seen it in the eastern tributaries of the Holston- 

 Tennessee system. 



