96 EDUARD UHLENHUTH. 



hiding behind the rocks. Shortly after this we caught two fishes 

 by means of hooks which were placed near the rocks where I had 

 seen the fishes ; both were catfish. And they were the only speci- 

 mens of fish which I ever saw in Ezell's Cave during the 12 days 

 I spent there. If these were identical with the individuals kep? 

 in the basin of the Artesian Well, it certainly would be proof of 

 the existence of a communication between the Purgatory Creek 

 System and the San Marcos Artesian Well. It would be of great 

 importance to trace the course of the water in Ezell's Cave and 

 Johnson's Well down to the reservoir of the Artesian Well. As 

 suggested by the possible migration of the catfish, such methods 

 could be easily designed and will be employed as soon as the in- 

 vestigations can be continued. 



In case of a connection between the two systems, the water 

 contained in each one would be a mixture of the Purgatory Creek 

 water and the sweet water. In all four places in question the 

 water has the same taste and the same temperature. It contains 

 besides the Typhlonwhjc a number of typical species, among 

 them the Palcemonetes antrorum, which I found to occur in all 

 four localities. 



OTHER LOCALITIES IN PURGATORY CREEK VALLEY. 



After it was found that the Typhlomolge inhabit subterranean 

 regions probably representing the Purgatory Creek System, it was 

 interesting to visit other caves of the Purgatory Creek. One of 

 them is Swift's Cave, on the slope closing the valley towards 

 southwest and abuot I mile above Frank Johnson's Well. The 

 entrance to the cave is situated at an altitude of 701 feet above 

 sea level. Though no water could be reached so far according 

 to what has been said above, it would have to be found about 114 

 feet below the entrance there is in this cave a narrow tube 

 leading down which has not been followed ; further examination 

 may reveal the presence of some passages to the water. 



Further up the valley 14 miles above San Marcos, Boyett's 

 Cave is located at an altitude of about 1,100 feet; there the 

 Purgatory Creek valley starts. No water was found in Boyett's 

 Cave down to a depth of 50 feet and no passages leading further 



