8O EDUARD UHLENHUTH. 



were supplied with various kinds of bait, but in this way only the 

 crustaceans mentioned above were caught. The Typhlomolge 

 did not seem to react to the bait, and later on when I observed the 

 animals in the laboratory, it became evident that the instinct of 

 hunger is not sufficiently strong in the Typhlomolge to make 

 them go into traps ; it is in fact very difficult to make these ani- 

 mals eat. Later on the traps were placed with one opening di- 

 rectly in the slit ; animals passing out from the slit had to go 

 directly into the trap. In this way 2 Typhlomolge were caught in 

 Johnson's Well, one in August, 1916, and another in September, 

 1916. After I had left, n more Typhlomolge were found by Mr. 

 C. A. Campbell and Mr. Rufus Smith who from time to time 

 looked after my traps. Thus, Frank Johnson's Well yielded us 

 13 specimens of Typhlomolge. They were caught as shown in 

 the following table. The number is, however, too small to war- 

 rant any conclusions as to a possible influence of the season upon 

 the frequency of the occurrence of Typhlomolge. 



August, 1916 i 



September, 1916 i 



November, 1916 2 



December, 1916 i 



January, 1917 2 



April, 1917 i 



Summer, 1917 2 



November, 1917 3 



One of the greatest difficulties encountered was to find a 

 method of shipping the animals from San Marcos to New York ; 

 most of them did not survive the trip. In fact, only two ever 

 reached the laboratory alive. The first seven specimens caught 

 were taken on the train in a bucket filled with water. The 

 jarring killed six. Among the eleven caught later on, only one 

 survived the trip. Its safe transfer was accomplished by a fortu- 

 nate incident. The animal was packed in a fruit preserving jar 

 filled entirely with water and shipped in the winter. On arrival 

 it was frozen tightly in a block of ice. This animal survived for 

 one year in the laboratory. The only thing it could be made to 

 eat were newly hatched larvae of Ambystoma maculatum. Though 

 kept for most of the time in a dark room, the skin which in the 



