168 ANNALS OF THE CARNEGIE MUSEUM. 
species belonging to the Ohio drainage (see below). Thus the fauna 
of the Kentucky River distinctly is an Ohioan fauna, and in this 
respect resembles the more eastern tributaries of the system (Licking, 
Big Sandy, etc.). 
Between the Kentucky and the Cumberland is Green River. We 
possess a list of shells chiefly of Barren River, a tributary to Green 
River, published by Price (1900), in which some “doubtful Unios” 
have been named by Simpson. This list is of little value, since it 
does not give exact localities, and since some identifications obviously 
are incorrect. In addition, a number of synonyms are quoted as 
distinct species. Besides this list, there are some older (Rafinesque, 
1820 and 1831; and Call, 1885), and some more recent (Simpson, 
1914), generally rather vague records from Green River, sometimes 
containing geographical mistakes. 
During the last few years, however, the fauna of Green River has 
been studied more intensively. I myself stopped off three times in 
this region, and was favored by fortune in being able to obtain a 
good representation of the Green River Naiad fauna. Further, Mr. 
W. J. Clench collected in this drainage during two seasons, 1924 and 
1925, for the Museum of the University of Michigan, and I was 
granted the privilege of examining his material collected in 1925, for 
which I wish to express my best thanks. In addition, Mr. B. Walker 
of Detroit had the kindness to send me a list of Kentucky Naiades 
represented in his collection, in which I found a number of records 
from the Green River drainage. This contained also an enumeration 
of the Naiades collected by Clench in 1924. I am under great obliga- 
tions to Mr. Walker for this. 
The localities, at which the recent collections wefe made are the 
following. (They are referred to in the text as indicated by the 
capital letters.) 
Mm—Green River, Mammoth Cave, Edmonson Co., Ky., Sept. 6, 
LOZ te GAO) 
In riffles at the lower end of an island, about three-quarters 
of a mile above the steamboat-landing at Mammoth Cave 
(head of navigation). Condition of river fair, water low, but 
not very clear. I found living shells by feeling for them in 
water from one to three feet deep, but also secured a great 
number of dead shells, recently taken out by muskrats. 
