6o Journal of Comparative Neurology and Psychology. 



worthless. The results were that they would not enter. Ten 

 observations were made ; in seven of these cases no crab (with- 

 in 5') went further than to the edge of the entrance, which had 

 in no experiment been counted as "in" ; of the three other 

 cases, within the period of 5 minutes, 5, 8 and 5, respectively 

 entered, but there was no evidence of progress. 



ADDITIONAL EXPERIMENTS- 



Maze Experiment. Can the Hermit learn to go through 

 a maze for its food ? A simple maze was constructed of thin 

 boards in such a way that it was necessary for the crabs, 16 be- 

 ing used, to enter at one end, go through to the other, enter 

 the second passage, go back to the otlier end and enter the 

 food compartment, The crabs were first given an opportunity 

 to "become acquainted" with the maze by leaving it in the 

 aquarium about two hours. The next day this was repeated 

 with the result given in the first line of the table. The results 

 are as follows : 



This experiment was not conducted as carefully as it would 

 be possible to make it ; the crabs could not be watched all of 

 the time, but only occasional observations and a record, as the 

 above, at a stated time, made. The results showed, however, 

 though perhaps not as clearly as might be desirable, that an im- 

 provement had taken place, and they have a value, as being in 

 general confirmatory of the first experiment. 



Conclusions. 



The Hermit Crab, Eiipagunis longicarpns, is capable of 

 piofiting by experience, in a rather short time, by associating 



