74 FAUNA OP MAYFIELD'S CAVE. 



C. bartoni is occasionally seen in Mayfield's Cave, but is not very- 

 abundant. It is found resting or crawling on the bottom of the pools 

 or, as is often the case, under a stone in the water, where it usually 

 constructs a burrow. Young C. bartoni in abundance appeared within 

 the cave about April 1 in 1905. 



As W. P. Hay says of this species: 



* * * Seems to take very kindly to a subterranean abode when the opportunity 

 is afforded (1896, 210). 



Its habits throughout the range are, so far as I know, practically uniform unless 

 conditions are such as to preclude the customary mode of living. It is a frequenter 

 of cool streams, where it lives under flat rocks or in holes which it excavates among 

 the pebbles. « • * in its effort to secure its favorite conditions of water, 

 temperature, etc., it is led to ascend streams, and although this ascent is doubtless 

 made slowly and the attempts at ascent are often stopped or seriously checked by exten- 

 sive rapids or heavy floods, it is nevertheless almost a certainty that through this habit 

 the animal has gone to the very headwaters of many a mountain stream and in favor- 

 able seasons has crossed the divide and reached the source of some other streams. 

 As in Virginia, West Virginia, Kentucky, Tennessee, and Indiana many of the small 

 streams have their source in cave streams, it is easy to understand that C. bartoni 

 is of common occurrence in the caverns of the region (1895, 487) . 



I think this species does not take less favorably to cave life than to 

 out-door life. It could readily escape from Mayfield's Cave by following 

 the downward course of the stream during winter or spring or after any 

 heavy rain. In none of the caves where I have seen it does there seem 

 any probability that it is cut off from escape. There is good reason to 

 believe that it not only does not attempt to escape from caves, but that 

 it has remained in Mayfield's Cave for long periods of time. 



A series of C. bartoni of all sizes was collected about Bloomington 

 and many measurements (length of body, of each antenna, of anten- 

 nules, of carapace, of the various appendages, width of carapace, of 

 areola, length and width of rostrum, etc. ) of the individuals were taken 

 and compared with similar measurements of individuals of a small 

 series from Mayfield's Cave. The results were plotted on coordinate 

 paper. It was ascertained that, when length of body and length of 

 antennae were compared, the curves showed a much greater length of 

 antennae for the cave forms; 58 specimens of terranean C. bartoni were 

 in Series I and 6 were in Series II from the cave. It was desired to 

 make both series larger, but more individuals of Series I could not be 

 obtained at the time and the Mayfield's Cave specimens were not often 

 found, so that after the collection of them was attempted but 6 with 

 complete antennae were secured. In Series I the antennae averaged 

 92.66 per cent of the length of the body and in Series II, 104.55 per 



