THE BKAIN IN THE EDENTATA. 



291 



hippocamp. vestigia 

 ex. 



Fig. 4. 



psalterium dors. 

 I 



Corp. / 

 callos. 



bulb, olfact 



I fiss. hippocampi 



f^^ fascia dentata 



-fiss. rhinal 



• . , , ,, . , I '^ \ N fimbria 



/ tubercul. olfact. | \ \_ \ \ 



Ilea, oiiact. commiss. ant. \ ,„. » ., 



, '. ^ \lob. pynform. 



psalterium ventr. \ 



tubercul. hippocampi 



comm habenuL 



Corp. pineale 

 a fiss. prima 



i =°!'P- ,' cerebellum 



I quadrigem. 



/ fisa. secunda 



foramen Monr. 



"ventr. IV. 



vel. medullar© 

 pons Varol. 

 commiss. moU. ; ( I 



Corp. mammill. | gangl. interped. 

 aquaeduct. Syl. 



Mesial surface of the brain of Orycteroims, exposed by mesial sagittal section. Xat. size. 

 The hemisphere above separated from the rest of the brain, and bdo^r in part attached to the brain-stem. 



Fig. .5. 



fiss. rhinal. ant. y ^ 

 bulb, olfact. : ^ ; : 



■ lob. pyriform. i 



fiss. rhinal. post. 



tract, olfact. 



tubercul. olfact. 



lob. pyriform. post. 



Scheme of the lateral aspect of the cerebral hemisphere of Oryctcroinis, to show a variation 



in tlie arrangement of its fissures. 



