44 



C. H. Tl FINER. 



not influence the movements, 25 per cent, of the movements 

 should be toward water, 12.5 per cent, toward the sun and 12.5 

 per cent, toward the way the head was originally pointed. The 

 experiments yielded the following results; 25.7 per cent, toward 

 water, 15.3 per cent, toward the sun and 17.1 per cent, toward 

 the way the head originally pointed. Evidently the movements 

 of blind crayfish, on the checkerboard plate, are not influenced 

 by the nearby bodies of water. 



TABLE IV. 



THE CRAYFISH (Cambarus, sp.?) BLIND (PLATE III). 



These thirteen blinded crayfish were placed on the ground, 

 within fifteen feet of a pond. Their heads were faced away from 

 the water. The land sloped gently towards the water and the 

 sun was shining brightly. At the end of an hour none had reached 

 the water. Several had wandered off into the shrubbery and 

 become lost, three had moved to within two feet of the water and 

 then turned and walked off in another direction, some were 

 wandering about at a greater distance from the water than their 

 original position and three were in practically their original 

 positions. 



In another series of experiments the crayfish [Cambarus 

 (Fraxonius) propinquus] were used in pairs. The eyes of one 



