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PROCEEDINGS OF THE AMERICAN ACADEMY. 



This may have been due to the small size of the animal, which ren- 

 dered it less able to withstand the unfavorable conditions in its en- 

 vironment after the eyes had been excised. The reactions summarized 

 in Table II. show that the species was negatively phototropic when in 



TABLE II. 



" Photic Reactions of Plethodon cineretts ervthronotus, 

 with and without eyes. 



normal condition. After the eyes had been excised, however, the move- 

 ments were without apparent reference to the light. This indifference 

 may, nevertheless, have been due to the effects of the operation rather 

 than to lack of photic sensitiveness in the skin. 



(e) Diemyctylus viridescens. 



Like Plethodon, this species did not stand the operation well and 

 gave no reactions which were manifestly due to light after the eyes had 

 been removed. Ten individuals were used, and the eyes were excised 

 from eight of them. None of the latter lived more than twelve days 

 after the operation. The results given in Table III. bring out the fact 



TABLE III. 



Photic Reactions of Diemyctylus viridescens, with and 

 without Eyes. 



