SCIENTIFIC PROCEEDINGS. 



Abstracts of Communications. 



Fifty-ninth meeting. 



Zoological Laboratory, Columbia University, May 20, IQ14. 

 President Lusk in the chair. 



79 (896) 



A comparison of the effects of labyrinthine and cerebellar lesions 



in the turtle. 



By J. Gordon Wilson and F. H. Pike. 



[From the Otological Laboratory of Northwestern University and the 

 Physiological Laboratory of Columbia University.] 



It is of some interest, in view of the tendency in some quarters 

 to insist upon the essential similarity of the effects of lesions of 

 the labyrinth and of the cerebellum, to ascertain whether this 

 supposed constancy of relationship obtains in animals with a 

 relatively small cerebellum. It may be mentioned that, anatom- 

 ically, the floor of the mid brain (the pons) and that portion of 

 the roof represented by the vermis cerebelli are phylogenetically 

 old. The lateral lobes of the cerebellum are new developments. 

 The cerebellum of turtles is represented by the vermis. The cere- 

 bellum in the genera of turtles used for experiment — Nanemys 

 and Chrysemys — is smaller than in the sea turtles. 



We have already pointed out the fact that there is a great 

 uniformity in the effects of labyrinthine lesions in all animals so 

 far studied 1 and that the effects in the turtle are much the same 

 as in other animals. 2 



1 Wilson and Pike, Philosophical Transactions of the Royal Society of London. 

 1912, Series B, Vol. 203, p. 157. 



s Wilson and Pike, Proceedings of the Society for Experimental Biology 

 and Medicine, 1913, XI, p. 52. 



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