94 



EDUARD UHLENHUTH. 



But as indicated above, it is quite probable that a direct com- 

 munication has been established between these two systems by 

 means of channels which according to our calculations would have 

 a depth of about 200 feet ; if this is a fact, the relation between 

 the various bodies of water in question would be as shown in 

 the diagram of Fig. 13. 



FIG. 13. Purgatory Creek System. Artesian Well and San Marcos Springs 

 at San Marcos, Texas. Diagrammatic section reconstructed from several 

 sections, showing the way in which these waters probably communicate with 

 each other. The figures indicate altitude above sea in feet. 



It is of great importance to ascertain whether or not such a 

 communication exists, since this would facilitate following the 

 Typhlomolge along the course of travel and since it would permit 

 conclusions as to the mode of the distribution of the species. 

 Besides the suggestive structure of Ezell's Cave there are a num- 

 ber of facts which are in favor of the existence of a communica- 

 tion. If no connection between the two systems exists it would 

 mean that the Typhlomolge lived in the subterranean rivers be- 



