380 



such continuity, and in several cases I have found (in the brains of 

 Egyptian Fellaheen) the folia of the tonsil prolonged upward into 

 perfect continuity with the ventral folia of the pyramid, thus con- 

 forming to the condition found in most mammals. 



Fiss. postpteroidea 

 Fiss. parapyr. 



Fiss. suprapyr. 



' Pyramis 



SS 



Area postpter. 



Paraflocc 

 Flocc 



■W$ 



VL^ noduli lus 



Fig. 20. 



v J^-y Pars bivent. 

 -Tonsilla 



bivent 



Pyramis 



Fiss. 

 parapyr. 



Uvula 



- - Mesenc. 



Lingula 

 Fiss. praeculminis 



Nodul. 



Uvula 



Fig. 21. 



Fiss. 

 postlun. 



Fiss. postpter. 

 Fiss. suprapyr. 

 \ Pyramis 

 Fiss. secunda 

 Fig. 22. 



Fig. 20, 21 and 22. The cerebellum of a human foetus at the end of the 5th 

 month. Fig. 20 representing the caudal aspect. X ^ 1 / 2 - Fig. 21 representing the 

 dorsal aspect. X 2. Fig. 22 representing the mesial sagittal section. X 5. 



There are several other points in the mode of subdivision of the 

 lobus medius and its relation to the floccular lobe in various mammals 

 which call for comment. 



In the account given above I have indicated the most primitive 

 mode of subdivision of the middle lobe. The pteroid area is a simple 

 undivided folium in many mammals (e. g. Dasyurus): when it be- 

 gins to expand it becomes split up into a series of folia arranged in 



