UPPER TENNESSEE DRAINAGE. 559 
region. However, in the collection of B. Walker, there are two large 
specimens of a form of Anodonta grandis Say, collected by Mr. M. 
D. Barber, of Knoxville, in a “small mud pond near French Broad 
River, 8 miles above Knoxville.” The largest has a length of 168 
mm., the other of 127 mm. In the latter, the beak sculpture is vis- 
ible, and corresponds to that of A. grandis; it has white nacre, and 
much resembles specimens of the var. gigantea Lea, as found in 
western Pennsylvania. The other (larger) is a little distorted and 
tapering behind, and has pale purple nacre, resembling in these char- 
acters some of the southern forms of the species. 
The occurrence of this form in this isolated locality is quite re- 
markable, but supports the view that Anodontas may possess excep- 
tional means of dispersal. According to more detailed information 
obtained by Mr. Walker in 1916 from Mr. Barber, the pond is 
“plainly natural, some 4 or 5 rods long by 2 rods wide, with soft 
deep mud. There was a small stream of water running to the 
French Broad River, just a short distance. This was 10 or II years 
ago.’ “Two years ago, I took a nephew and found the same pond, 
but although we waded the pond in every direction, up to our knees 
in mud, we could not find even a fragment of gigantea. A man liv- 
ing near there said he had seen large shells in another pond near, 
but I have not examined it.” These ponds, a short distance from the 
river, probably are on the flood plain of French Broad; the writer 
has not been able to locate them on the U. S. Geol. Surv. maps. 
Type locality: Port Gibson, ‘Claiborne Co., Miss. 
Genus: ANODONTOIDES Simpson (1898). 
Ortmann, 120, p. 294. 
39. ANODONTOIDES FERUSSACIANUS (Lea), 1834. 
Anodonta ferussaciana Lea, ’34.—Anodontoides ferussacianus Ort- 
mann, *12b, p. 294 (anatomy)—Anodontoides ferussacianus 
Simpson, ’14, p. 467. 
Anodonta oblita (?) Lewis, ’71, may possibly stand for this 
species. Lewis doubtfully reports this from the Tennessee below 
Knoxville, but this probably is a mistake. Originally, 4. oblita Lea 
