60 
On November 22d, I started for Mammoth Cave. The objects I espe- 
cially wanted were the very rare Chologaster agassizii, specimens of 
AmbDlyopsis from south of the Ohio, Typhlichthys subterraneus and the 
cave rat, Neotoma. Mr. H. C. Ganter, manager of Mammoth Cave, did 
everything in his power to make my trip both successful and pleasant. 
Although all the likely places were examined, not a single Typh- 
lichthys or Amblyopsis could be found. After a day in searching for 
Chologaster, when almost despairing, we found, in a little pool of the river 
Styx, several of these very rare fishes lying on the bottom. As soon as my 
net touched the water they were off, and since the mud at the bottom was 
very easily riled but two specimens were secured. Next day the same 
spot was visited, when two more specimens were secured. 
A horse-back ride of several miles brought us to Cedar Sinks. The 
roof of an enormous cavern has here fallen in ages ago. At one end the 
overarching rocks, which form part of the sides of this ancient dome,,. 
still bear witness to the existence of a former stupendous structure which 
covered several acres of ground. At the bottom of this cliff a few small 
openings lead into caves. One of these, judging from the strong current 
of air passing into it, must be a large cave. In these caves an additional 
specimen of Chologaster, the largest secured, was taken, and this repaid 
amply for all the trouble it had cost to come. 
One cave rat was killed in Audubon Avenue in Mammoth Cave. An 
account of this rat, as well as of Chologaster, will appear elsewhere. 
One other catch of great importance was made. I secured a specimen 
of Cambarus pellucidus with young. <A good series of these has been 
preserved for future study. 5 
A few words should be added about Mammoth Cave itself. I came 
to this cave the second time, regarding it simply as a locality harboring 
cave animals. Opportunities came to see much of the cave, and I must 
confess haying become impressed with the value of the scientific problem 
the cave itself presents and the absorbing interest of its scenery. There 
are really four tiers of caves, one above the other. The upper two stories 
are dry, but the lowest contains water permanently. The present outlet 
of the cave is practically on a level with Green River at its low stage, 
and if the size of the cave increases it can only be by dissolving the bed 
rocks of the Echo and Styx Rivers. The water is said to rise sixty feet 
and more during heavy rains, the outlet of the cave streams being very 
small. The different levels of the cave are joined by direct channels, by 
