582 ORTMANN— NAYADES OF 



French Broad and lower Nollchucky (Hamblen Co.) ; all the way 

 up the Holston to the North Fork at Rotherwood, Hawkins Co., 

 Tenn. Also in the Clinch up to St. Paul, Wise Co., A^a., and the 

 Powell up to Comhs, Claiborne Co., Tenn. 



Type locality: Lake Erie (topotypes examined). 



Note: The Lake Erie form differs somewhat from that of the 

 central basin. If it should be found to be desirable to express this 

 in nomenclature, E. recta should be reserved for the lake form, and 

 E. recta latissima (Rafinesque), '20, should be used for the other. 



Genus: Lampsilis Rafinesque (1820). 

 Ortmann, '12b, p. 345. 



70. Lampsilis viRESCENS (Lea), 1858. 

 Unio virescens Lea, '58. — Laiiipsilis virescens Simpson. '14, p. 93. 



I am not quite satisfied as to the proper position of this species 

 within the genus Lampsilis. According to external appearance, it 

 seems to be related to L. liiteola (Lam.), although it also has some 

 features, which resemble those of L. teres (Raf.) (=anodontoides 

 Lea). In either case, however, it would be a Lampsilis. 



The type locality is Tennessee River, Tuscumbia, Colbert Co., 

 Ala., and it has been reported, by Call, from Spring Creek at Tus- 

 cumbia. The Carnegie Aluseum has it from tributaries of the Ten- 

 nessee in northern Alabama (Paint Rock River, and Bear Creek). 

 It has never been found anywhere else. 



But I have found a few specimens (all males) in I^lmory River, 

 at Harriman, Roane Co., Tenn., and in the Walker collection are 

 others from Coal Creek, Anderson Co., Tenn. These two streams 

 are not far apart, and flow from Walden Ridge to the Clinch. 

 Emory River is the only western tributary which completely cuts 

 through Walden Ridge and drains, in its headwaters, a section of 

 the Cumberland Plateau. 



71. Lampsilis ovata (Say), 1817. 



Unio ovatiis Say, '17. — Unio ovatus Lewis, '71. — Unio ovatiis Pils- 

 bry & Rhoads, '96. — Lampsilis ovata Ortmann, '12/', p. 350 

 (anatomy). — Lampsilis ovata Simpson, '14, p. 48. 



