Stroud, Mammalian Cerebellum. 115 



into preramus and postramus ; also the beginning of the regions found in a me- 

 sal aspect of the adult organ. Compare with Fig. 67, also fetal, although 

 adult features exist. Note the relative difference in size of the preramus in the 

 two figures 64 and 67. I am in doubt about the part marked lingula in Fig. 64. 

 This subject will be discussed further in Part II. 



Figs. 6j, 66, 67. Cerebellum of a human embryo, No 2279, size, age, and 

 sex unknown (x 4). The specimen had been medisected and the left half partly 

 dissected by a previous observer. 



Fig. 6j. The dorso-caudal aspect of the cerebellum is foliated, but less 

 than in the adult. The following features are shown, 



a. The form and divisions of tbe caudal three lobes of the postvermis and 

 their relation to the pilea and floculus. 



i>. The enormous development of the pilea and the consequent covering 

 up of the flocculus and paraflocculus. 



c. No attempt has been made to describe the different lobes of the pilea 

 since that subject and comparisons with other mammals can be more profitably 

 discussed in part II. 



(/. The metepicoele (" fourth ventricle ") and its relations to the parepi- 

 coele. 



e. The relation of the parepiccele to the flocculus and kilos; the latter 

 forms what is commonly known as \}!\& postvelum,Jiinteres Marksegel, valvula sem- 

 ilunaris, etc. 



f. The relation of the plexus to the parepiccele. 



g. The existence of the flocculus and paraflocculus as distinct regions of 

 the cerebellum, demarcated by sulci. These features are concealed by the over- 

 hanging pileum upon the right side. The pileum has been dissected away from 

 the left side. The fiber relations of the flocculus are very peculiar; a large 

 bundle goes ventrad into the pons. These relations will be discussed in part II. 



h. The continuity of the uvula with the tonsilla. 



Fig. 66. Right lateral aspect. The left half had been previously dissected. 

 Shows the division of the cerebellum into two unequal parts, the preramus the 

 smaller and cephalic, and the postramus, the caudal part. The latter forms the 

 chief mass of the organ. This is again divided by the peduncular sulcus into 

 prepileum and postpileum ; compare Fig. 67. The prepileum and preramus be- 

 come furrowed earlier than the postpileum. Even in this specimen the 

 sulci of the postpileum have not yet reached its lateral border. Compare Figs. 

 69 and 70, PI. VIII. The figure also shows a lateral view of the paraflocculus, 

 flocculus, the fifth and eighth nerves, the peduncle, and the pons. 



The human paraflocculus becomes more or less foliated; indeed so far as my 

 observations have gone it is quite variable ; but I do not feel certain that there 

 is the division into supraflocculus and mediflocculus, which is so general in 

 the lower mammals. 



Fig. 67. Mesal aspect. Shows the same features that are to be recognized 

 in the adult organ, but in a condition to be more easily understood. The most 

 obvious features are, 



