HARRIS : CRAYFISHES GENUS CAMBARUS. 125 



Miss Wilson, who was with me, thinks the crayfish devour the 

 others. She has never seen them together, and says the latter 

 keep away from the former, though she had not noticed the 

 crayfish catching or eating them. There was nothing to pre- 

 vent the crayfish ascending the stream to where the others 

 were." 



"On my first visit, the water being low, no crayfish were 

 seen in the dark nook, the place favored by the fish. After the 

 storm, which had flooded the caves, a few were found there. 

 Though I watched for some time I never saw them pursue the 

 fishes, as they might easily have done, guided by the stir in the 

 water. Both creatures are very sensitive to the slightest rip- 

 ple. During high water, a pool, 'the lake,' is formed a little 

 way from the stream in another dark part of this cave. In low 

 water this pool is cut off from the creek. I found both species 

 in it, the fish in the darkest part, and saw no signs of enmity. 

 Most of the crayfish were found in ihe lower part of the stream 

 in the twilight; the fishes could not be found without the lan- 

 tern. At the time of the floods the cave is full and the water 

 rushes out furiously. Another proof that the crayfish are more 

 fond of the light is seen in the shallower wells. That from 

 which most were taken was more exposed to the sun. At noon, 

 when the light was more favorable, we could see them swim- 

 ming about. No fishes have been taken from this well. They 

 are taken in the narrower, more shaded wells, of which the 

 deep ones on the hills report fishes only. 



"As to the food of the fishes, I discovered nothing. The mud 

 where they were was not so deep as farther down. An examina- 

 tion of the length of the cave brought to light many snails ; 

 the shells of the living ones are whiter and more nearly trans- 

 parent than the floating dead ones. The largest crayfish are 

 of a dirty, rusty color, and very bristly, in caves and wells. 

 One large one is very soft and very white. No doubt it is newly 

 molted." 



"Both fish and crayfish were less numerous after the freshet, 

 and apparently less active. The disturbance of the flood may 

 have caused them to retreat into their hiding-places, only the 

 weaker being left behind, or some may have been swept away 

 by the torrent. The sensitive creatures would soon die in the 



