Anatomy. — "The Forebrain ot' Aptenjx AuMralis" . By John I. 

 Hunter, M. B. Cli. M. (Sydney). (Froiri the Cenlral Institute 

 of Brain Reseairli, Amsterdam). (Communicated by Prof. 

 L. BOLK). 



(Communicated at the meeting of December 29, 1923). 



I. (ienernl Features. 



An examination of the external form of the brain of the New 

 Zealand i<i\vi [Afyteryx <mstraHs) reveals the presence of distinct 

 differences from the usual condition exhibited by the avian brain. 

 The general sliape of the cerebral hemispheres is peculiar in that 

 the frontal extremities are somewhat more pointed than usual, and 

 the lateral surface proceeds backwards by a gentle convexity to the 

 posterior extremity. 



The characteristic subdivision of the cerebral hemisphere of birds 

 into a pars niedialis and pars lateralis, of which the pa7^s lateralis, 

 may enwrap the pars inedialis to form the frontal pole, is not 

 visible in this specimen (fig. I). For the pars inedialis {?,&%\i\.&\-v/Vi\si 

 of Edingfr, Wallenberg and Holmes, 1903) is not indicated, though 

 there is an ill-defined bulging on the postero-medial part of the 

 dorsal surface of this hemisphere. In consequence of this the va//«CM/a, 



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