554 ZOOLOGY. 
Balls of hair very compact and smooth are of common occurrence in : 
the stomachs of cattle, but stony concretions seem very rare.— 
G. H. Perkins, Burlington, Vermont. 
ANIMALS OF THE Mammoru Cave.—[Since the account of the 
Blind fishes of the Mammoth Cave was published in the Natural: 
ist for January, 1872, I have accidentally met with the letter by ` 
Prof. B. Silliman, Jr., printed in the Amer. Jour. of Science, vol. 
ii, 2d series 1851, p. 332, giving an account of his visit to the cave 
in 1850. As there are several points of interest referred to in re- 
lation to the animals of the caye-which I should have quoted in my 
article had I known of Prof. Silliman’s at the time, I now make 
the following extract, especially calling attention to the statement 
relating to the fish with color and eaternal eyes, in the hope that 7 
urther information may be obtained about this otherwise unknown 
species. Is it the “ black fish” of Tellkampf ? 
The account of the rat found inthe cave and incapable of sight 
special interest in connection with the cause of ee 
animals of the cave, and may be used as an argument that simple 
disuse of the organ of sight does not necessarily bring a ; 
atrophy of the eye, and that we must look to other than exter - 
conditions for the cause of the non-development of the eyes 1 a 
many of the animals of the cave. — F. W. P è 
are comparative 
the lar gest diek 
‘burrowing in the nitre earth. There are some small w three vials 
also which I suppose are Crustacean. Unfortunately, Jost with 
containing numerous specimens of these insects WORS E 
my valise from the stage coach, and I fear wil aes d 
Of the fish, there are two species, one of which has pree a whichis 
by Dr. Wyman in the ‘ American Journal of Science; be Sis 
P3 also it is said the fish of Green river are to be aei re S0 
in the rivers of the cave. Among the go : 
