556 ORTMANN—NAYADES OF 
Everywhere in the larger rivers: Tennessee, Holston, French 
Broad, Clinch, and Powell; goes up, in the Powell, to Jonesville, 
Lee Co., Va.; in the Clinch, to Clinchport, Scott ‘Co., Va.; in the 
Holston to the South Fork at Pactolus, Sullivan Co., Tenn.; in the 
French Broad, it goes to the Nolichucky at its mouth( Chunn’s 
Shoals, Hamblen Co., Tenn.). It is also in Emory River, up to 
Harriman Junction, Roan Co., Tenn., and in Hiwassee River, at 
Kincannon Ferry, Meigs Co., Tenn. In the Tennessee below Knox- 
ville, and down to Chattanooga, it is extremely abundant. 
Type locality: Ohio River. 
34. ELLIPTIO DILATATUS (Rafinesque), 1820. 
Unio dilatatus Rafinesque, ’20——Unio gibbosus Lewis, ’71—Unio 
gibbosus Pilsbry & Rhoads, ’96.—Elliptio gibbosus Ortmann, 
'12b, p. 271 (anatomy ).—Elliptio dilatatus Ortmann, 7130, p. 311. 
—Elliptio gibbosus Goodrich, ’13, p. 94.—Unio gibbosus Simpson, 
14, p. 597.—Unio dilatatus Vanatta, ’15, p. 555.—Ellptio dilatata 
Utterback, ’16, p. go. 
Common, in large rivers as well as in small creeks, possibly the 
most widely distributed species in the upper Tennessee region, so 
that it is heardly required to name special localities. However, it 
should be mentioned that it is one of the species which go up, in 
French Broad River, to Asheville, Buncombe Co., N. Car. (Walker 
coll.). , 
In our region, this species is of moderate size, and purple color 
of the nacre prevails; only specimens from the French Broad are 
more frequently white-nacred. 
Type locality: Ohio River (the type is from Kentucky River, ac- 
cording to Vanatta). 
Genus: LASTENA Rafinesque (1820). 
Ortmann, ’12), p. 297, and ’15, p. 106. 
35. LASTENA LATA (Rafinesque), 1820. 
Anodonta lata Rafinesque, ’20.—Margaritana dehiscens Lewis, ’71.— 
Lastena lata Goodrich, ’13, p. 94—Lastena lata Ortmann, ’I5, p. 
106 (anatomy ).—Lastena lata Vanatta, ’15, p. 554. 
