82 FAUNA OF MAYFIELD'S CAVE. 



a Limax, was seen a few times near the mouth. Small, usually empty, 

 shells of a single species of gastropod were seen from the mouth to 

 "17," about debris, and a similar shell was found in Truett's Cave. 

 Two or three times this mollusk was found alive. The occurrence of 

 this shell is probably accidental. It is found in locations which suggest 

 that it has been washed in through the sink-holes near " 12. " 



Ulrich (1902, 85) mentions 4 species of gastropods from Ezell's Cave, 

 near San Marcos, Texas. Call (1897, 387) found a small species in 

 Mammoth Cave, which is probably a true cave form, and Chilton (1894, 

 246) discusses a species without pigment from wells in New Zealand. 

 Zonites subrupicola, found in Clinton's Cave, Utah (Packard, 1877, 163) 

 and later under stones in California (Packard, 1888, 21), is a bleached, 

 almost white form. 



Class PLATYHELMINTHES. 

 Order TURBELLARIA. 



Three flatworms were found in the pools in the cave. They were 

 almost or quite without black pigment, but had distinct eyes. 



Packard (1888, 27, 28) found a white eyeless planarian (Vortex? 

 cavicolens) in Carter Cave, Kentucky, and another {Dendrocadum 

 percsecum) , also white and eyeless, in Mammoth Cave. I found the 

 latter species in Mammoth Cave and also in White's Cave, near the 

 Mammoth Cave. 



LIST OF SPECIES. 



The total number of species taken from Mayfield's Cave and con- 

 sidered of sufficient interest to mention in this paper is 110; 75 

 species have heretofore been recorded from those caves of Indiana, 

 about 25 in number, in which collections have been made. The table on 

 the following pages compares my list of species from Mayfield's Cave 

 with Blatchley's list collected in 1896 and with other lists from all the 

 Indiana caves. 



The species are classified as (a) strays, or accidental visitors; (6) 

 visitors, going into the cave and leaving at will; (c) temporary residents, 

 hibernating in the cave or spending a part of their existence there; 



(d) permanent residents, spending their whole lives in the cave; and 



(e) species which live in the cave exclusively, never being found else- 

 where. Other columns arrange species with regard to their relation to 

 light, the grouping being as follows: Those living in (a) bright twilight 

 only; (h) twilight only; (c) twilight, and rarely in darkness; (d) rarely 

 in twilight and habitually in darkness; and (e) darkness only. 



