MOEPJIOLOGY OF TJIE BRAIN I\ TJIK MAMMALIA. 



Of' 



equally ticcisivc remarks of Milne-Edwards*, and Flower's hesitation in adopt iii;^' thc 

 view -which seemed so obvious, one naturally becomes sceptical of the existence of such 

 a ventricular diverticulum in any Prosimian brain. 



If a horizontal section be made through tlie cerebral hemisphere of any J.emur so as 

 to pass just beloAV the level of the corpus callosum, the pericalcarine region will ]>res(mt 

 the appearance represented in the figures 1!) {Xt/c/.icebi(s) and ."iO {Lemur J'uIcks). 

 The hippocampus is prolonged mesially into continuity with a long pallial folium, which 

 extends almost as far as the mesial plane and then becomes sharply bent upon itself so 



Fig. 49. 



Fig '■-0 



sc. 



Fig. 41.1. — yi/ctii-eliii6- tardhifiiiliix. llciri/.outiil st'ction through the cerebral hemisphere 



iinnicMliatfl}- bcknv the ecirpus callosum. .x -. 

 I'ig. SO. — Lemur faints. Part of a eorrespouding seetiou. x 4. 

 Fig. 51. — C'mro'pitJieciis snhti'iis. A. eorrespondiiig section. x -. 



as to form the slightly oblique anterior wall of the deep calcariue sulcus. At the 

 bottom of the calcariue sulcus the pallium again becomes acutely fle.\ed and forms 

 the posterior lip of the calcariue furrow. It is of the utmost importance to recognize 

 at this stage that the anterioi- wall of the calcariue sulcus forms a part of the bouiulary 



* Only so far as the Iiidrisiu;i! arc concerned ; for, in view of these results of my recent re-examination of the- 

 genus l.tmur, 1 fail to understand the significance of Milne-Ed wards's reference to this genus (v(V/« su/>i-(i). 



