232 BULLETIN OF THE 



of the species by the caves appears to differ somewhat, it will be well to 

 consider them separately. The following is the entire list of species : — 



Geotriton longicauda, from Wilson's Cave. 



Plethodon sp., larva?, " " 



Cambarus virilis Hagen, from the wells, Wilson's Cave, and streams. 



C. setosus n. sp., from the wells, Wilson's Cave. 



Asellus Hoppince n. sp., from Day's Cave, in mud under stones. 



Physa heterostropha Say, from caves and wells. 



Scolopocryptops sexspinosa, from wells. 



Plathemis trimaculata DeGeer, from mouths of caves. 



Hygrotrechus remigis Say, from near mouth of Wilson's Cave. 



Dineutes assimilis Aube, " " " 



Agabus sp., from Day's Cave, under rocks. 



Ceuthophilus Sloanii Pack, from the water in Wilson's Cave. 



FISHES. 



Typhlichthys subterraneus Girard, the only blind fish in the 

 collection, is represented by a large number of examples, the majority of 

 them taken from the wells, the balance from the caves, with the exception 

 of a single one from the creek outside. Compared with specimens from 1 

 Kentucky and Tennessee, they agree so exactly as to raise the question 

 whether the species was not originated in one of the localities and thence 

 distributed to the others. The opinion generally held is, that the cave 

 species of Indiana, Kentucky, and Tennessee originated in their respect- 

 ive localities. It is no doubt true for some of them. The idea is well 

 supported by the insects and Crustacea, the species in one section being 

 unlike those of the others. It may be urged that the respect in which 

 the fishes differ from them is more appai'ent than real, since these Crus- 

 tacea and insects were derived from a number of distinct species, while in 

 all probability the same species of fish entered the caves in each dis- 

 trict, and, being under the same influences in each, suffered the same modi- 

 fication in each. Keduced to its lowest terms the question, so far as the 

 fishes are concerned, is this : Were the blind fishes distributed to the 

 scattered localities where now found before or after they became blind 1 

 In favor of independent origins at distant points, it can be said that a 

 species, distributed over the valley, possessed of habits such as would 

 lead it to place itself under the modifying conditions of the cave in one 

 place, would be most likely led to do so in the others. On the other 

 hand, we have the more hesitation in accepting the conclusion that one 

 and the same species originated independently in two or more different 



