369 



Fu.. tU 



Fig. 1. A diagram representing the fundamental and more constant secondary 

 fissures of the mammalian cerebellum spread out in one plane. 



Mesenc. 



Bulb, olf 



Cerebel. 



Fiss. postnod. 



Fiss. postnodularis 



Velum ~ 



| Parafl. Floe. 

 Fiss. thin. 



Fig. 2. 



Tub. acust. 



Mesenceph. 



Fiss. postnodularis 



Fiss.- prima 



,- Fiss. floe. 

 ■-- Floe. 



Nodulus 



Fiss. preculm 



Velum 



Pix. chor. 



Fiss. 

 secunda 



Fiss. post- 

 nodularis 



Fig. 3'. Fig. 4. 



Fig. 2. The left lateral aspect of the brain of a pouch specimen of Dasyurus 

 viverrinus (head-length 1,5 cm). X 4. Corresponding to the foetal stage in other 

 mammals when the rhinal fissure first makes its appearance in the cerebrum. 



Fig. 3. A mesial sagittal section through the cerebellum and medullary velum 

 of an early-foetal Gazella dorcas. X 10- 



Fig. 3'. The dorsal aspect of the same cerebellum to show the confluence of the 

 postnodular and floccular fissures. The parafloccular fissures are not yet developed. 



Fig. 4. Mesial sagittal section through the cerebellum represented in Fig. 2. X 1^. 

 Anat. Anz. XXIII. Aufsätze. 24 



