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exhibited were a series of crayfish of two species. Of 

 one, the common blind species of the cave, Cambarus 

 pellucidus, several specimens were exhibited ; most of 

 them were white, but three were of a light drab color. 

 Of the other species, probably the Cambarus Bartonii, 

 there was a large specimen of the ordinary color, and 

 another quite small one that was very light colored, while 

 several others now in alcohol were also obtained from 

 the cave in company with the blind species. 



In another cave, situated several miles down the Green 

 River from the Mammoth Cave, and on the opposite bank, 

 which was christened "Blind-fish Cave," a number of spec- 

 imens of the blind Typhlichthys and several blind cray- 

 fish were collected. The peculiarity of this cave consists 

 in the fact that from its entrance, under a shelving rock 

 which is considerably above the bed of the Green Iliver, 

 issues a small stream of water which can easily be fol- 

 lowed for a short distance, and by crawling along its 

 bed for some few hundreds yards farther. In this cave 

 the blind fishes and blind crayfishes were found not far 

 from its entrance, and, at times, they have been taken by 

 other persons quite out in daylight, yet they are identical 

 in every way with those of the Mammoth and other caves 

 where utter darkness prevails. 



Certainly all these facts must be taken into considera- 

 tion if the attempt is made to account for the origin of 

 cave life, but until the present time many of them have 

 been unknown, and consequently only a very few were 

 used as furnishing proofs of the theories which have been 

 advanced. With these new facts before us it certainly 

 behooves us to be deliberate in drawing our conclusions. 



Note. Having hinted on this and previous occasions that, from 

 the apparent continuance of marine forms of life in the subterranean 

 regions of the southwest, there may have been caves, of greater or 



