381 



a feather-like pattern, and it projects to form the lateral extremity 

 of the non-floccular part of the cerebellum (Fig. 23): in all the large 

 Mammalia and especially in the Primates it forms a very large part 

 of the dorso-caudal aspect of the organ (Fig. 24) and pushes the post- 

 pteroid and parapyramidal areas mesially to form the vertical worm- 

 like band, which I have called the paravermis (Fig. 24). (This con- 

 dition is well exemplified in the Carnivora and the Prosimiae.) As 

 the result of the pushing inwards of the paravermis a shallow furrow 

 (vallecula paravermiana) is developed between it and the vermis: in 

 this furrow the connecting -bands passing between these two parts of 

 the cerebellum are submerged and the exact mode of connection dis- 



Vall. paraverm. 



Area 

 pteroid 



Parafl 



Pars 

 suprapyr. 



Pyramis 

 Fiss. sec. 

 Uvula 



Nodulus 



Area postpteroidea 



Fiss, postpter. _ 



Area 

 pteroidea 



Area parapyr/ 



Pars 

 / suprapyr, 



Lobulus Flocc, 

 petrosus paraflocc. 



Fig. 24. 



Paraflocc. 



rea pteroid. >' 



Area postpteroid. 



Lobulus petrosus 

 paraflocc. 



Fiss. prima 

 Pars suprapyr. 

 , Fiss. suprapyr. 



Pyramis 



Uvula 



Nodulus 



Flocc. Paraflocc. 



Fig. 25. 



Figs. 23, 24 and 25. Semi-diagrammatic representations of the caudal aspects of 

 the left half of the cerebellum in Lepus (23), Lemur (24) and Cebus (25), all 

 enlarged. 



