HARRIS : CRAYFISHES GENUS CAMBARUS. 117 



Faxon ('85), finding a small specimen in a jar containing C. 

 j)uinami from Green river, near the Mammoth cave, concludes 

 that the blind species sometimes finds it way out of the cave. 



During the summers of 1891 and 1892, Hay ('93) made ob- 

 servations on the blind crayfishes of southern Indiana. Mate- 

 rial was collected in Monroe, Lawrence and Orange counties. 

 Between the localities visited in Monroe and Lawrence counties 

 no material was obtained, owing to the heavy autumn rains, 

 which had so muddied the subterranean streams as to obscure 

 everything in them. In Shiloh cave, Lawrence county, he found 

 them very common. He says : "The cave is a capacious one, 

 and is traversed by a good-sized stream which will average a 

 foot in depth. The bottom is of gravel, and full of small stones, 

 which have fallen from the ceiling. A few crayfish were found 

 here, but it was in a small branch running into the large stream 

 about an eighth of a mile from the entrance of the cave that 

 they were most abundant. The bottom of the branch is com- 

 posed almost entirely of an exceedingly fine clay, with here and 

 there a large rock that affords a ready resting-place for the ani- 

 mals." 



"When first observed, the crayfish were generally, I might 

 almost say always, resting quietly in some shallow part of the 

 stream on one of the banks of clay. They lay with all their 

 legs extended and their long antennae gently moving to and fro. 

 Once or twice I saw them on the shore a foot, at least, from the 

 water, and one of these appeared to have been digging in the 

 soft mud. When in the water I found it almost impossible to 

 catch them with the net, and, after a few trials, threw it aside 

 as useless. A much surer method was to approach them 

 slowly with the hand and then suddenly seize them. When 

 once touched they started off in great haste for some protecting 

 rock, but often in their alarm would dart out on the bank, 

 where they would lie, unable to get back to the water. They 

 did not appear to be at all sensitive to the light. I have often 

 tried the experiment of slowly passing my candle back and 

 forth a few inches above them, or of suddenly removing the 

 light and then bringing it close again, but with no effect what- 



ever." 



Noise has no effect ; a loud call or a shrill whistle they do 



