IO2 EDUARD UHLENHUTH. 



8. The rarity of the Typhlomolge seems to be due to the ani- 

 mal's habit of preferring deep lying cracks or crevices, com- 

 pletely filled with water at a higher pressure than exists in the 

 more open bodies of water located at higher levels. 



9. As regards the habits of the Typhlomolge in its natural 

 habitat we were able to confirm Normann's observations made in 

 the laboratory in respect to the peculiar mode of walking of this 

 animal and its indifferent attitude to light. But we did not find 

 the animal particularly sensitive to water waves. 



10. In feeding and swimming when aroused, Typhlomolge 

 shows a close resemblance to larvae of Eurycea rubra. 



u. The assumption, however, that Typhlomolge is the larva 

 of some unknown and still existing species of the genus Eurycea 

 as made by Emmerson could not be confirmed, since with the ex- 

 ception of the species Plethodon glutinosus no tailed Batrachians 

 were found in the caves. More important than this assumption 

 is the fact that Typhlomolge, according to Emmerson, lack a 

 thyroid, which would explain why these animals cannot meta- 

 morphose. 



12. In order to collect a large number of specimens necessary 

 for experimental work and intensive study of the species, as 

 many places as possible must be discovered which may contain 

 Typhlomolge, and collecting must be conducted simultaneously 

 in all these places. 



13. The best method of catching the animals is by trapping, 

 but this method must be improved. It seems probable that live 

 bait is not attractive to the animals. Instead of relying upon bait, 

 the large openings of the traps should be laid in the path of the 

 animals. 



I desire to express my indebtedness and warm thanks for the 

 assistance which they have so generously rendered me in this 

 work, to the persons whose names I take pleasure in stating 

 below : 



Mr. C. A. Campbell, instructor in biology at Coronal Institute 

 in San Marcos, for his enthusiastic and skillful assistance and 

 his most enjoyable company during the collecting trips. 



Dr. H. F. Moore, Acting Commissioner of U. S. Fish Hatch- 



