96 Journal of Comparative Neurology. 



23). Contrast with the condition in man where the postpileum 

 forms the chief mass of the postramus. See Figs. 70-75. 



From the great size of the pileum, its amount of cortex, 

 and its intimate connection with the myel caudad and the cere- 

 brum cephalad, it would seem that it must be in some way cor- 

 related with man's superiority or erect attitude. 



In the lower mammals, the prepileum is the larger. 



The paraflocathts. — A general idea of the paraflocculus of 

 the lower mammalia can be obtained from a study of the cat's 

 cerebellum. It is a large, richly foliated structure lying be- 

 tween the prepileum and the flocculus and apparently of great 

 functional value. It is divided into two lobes — the suprafloccu- 

 lus dorsad, and the mediflocculus ventrad — by the deep inter- 

 floccular sulcus. The supraflocculus is connected with the post- 

 pileum by substantial nervous substance. This connection is 

 obscured in the adult by the superficial development of the ad- 

 jacent parts. 



In man, on the contrary, it is variable, small, and would 

 seem to be a degenerated structure of comparatively unimpor- 

 tant functions. In him it is foliated, but I do not feel certain 

 that there is a proper division into supra- and mediflocculus; it 

 appears to be larger in the embryo than in the adult. 



The same connection with the postpileum appears to exist 

 in human embryos, but in the adult it is even more obscure than 

 in the cat. Compare Figs. 17, 19, 22, 23, 58, 60, 71, 75. 



The mesal connection of the mediflocculus with the post- 

 vermis is clearly shown by the ridge of nervous matter, the ver- 

 mian tract, an enormous bundle of fibers ; it is not readily rec- 

 ognized in the adult, but appears in Figs. 17, 19, 65, 71. 



In general it may be said that the adult cerebellum in both 

 man and the cat presents such a plump and compact superficial 

 development that many of the embryonic features are recog- 

 nized with difficulty. 



TJie flocaihts. — In both man and the cat the flocculus proper 

 is foliated and would appear to have about the same morpho- 

 logical significance. It arises from the caudo-lateral part of the 

 roof, between the paraflocculus and kilos; Figs. 17, 18, 58, 60, 



I 



