383 



dorsal limb of the paraflocculus is, to some extent, pushed outward 

 by the paravermis. The lowermost portion of the paravermis becomes 

 separated as the tonsil, which, however, assumes its large dimensions 

 and characteristic form only in the brain of Man. Even in the 

 Simiidae it is quite'small and not very different from that of the other 

 Apes. 



The floccular lobe presents essentially the same features in all 

 the Primates, except the genera Simia, Anthropopithecus and 

 Homo. It consists of a small, multifoliate, fan-shaped flocculus and a 

 large, two-limbed paraflocculus, the ramus dorsalis of which is much 

 more massive than the ramus ventralis (Figs. 24 and 25). Part of the 

 ventral limb of the paraflocculus forms a strongly -projectiüg feather- 

 like "petrosal lobule", which becomes lodged in its own fossa in the 

 petrous temporal. 



The same form of floccular lobe is retained in the genus Hylo- 

 bates (op. cit. infra, 6): but in all the other Simiidae and in Man 

 the paraflocculus dwindles and loses its petrosal lobule and its bila- 

 minar arrangement and forms an exceedingly variable group of small 

 folia, which is usually hidden away between the flocculus and the rest 

 of the cerebellum (op. cit. infra, 6). 



The facts embodied in this sketch are the result of an examination 

 of a very large series of adult and foetal brains, for which I am 

 chiefly indebted to the generosity of Professors Wilson and Baldwin 

 Spencer and Dr. J. P. Hill (Australia), Dr. Charles Hose (Borneo), 

 Dr. Robert Broom (South Africa), Mr. Stanley Flower (Egypt) and 

 especially Professors Howes and Charles Stewart (England), to all 

 of whom I wish to express my thanks. 



Bibliography. 



1) Kuithan, Walther, Die Entwicklung des Kleinhirns bei Säuge- 

 tieren. Münchener medizin. Abhandlungen, 1895, p. 1 — 40. 



2) Stroud, B. B., The Mammalian Cerebellum. Part 1. The Develop- 

 ment of the Cerebellum in Man and the Cat. Journ. of Compar. 

 Neurol., Vol. 5, July, 1895, p. 72—118. 



3) — , A Preliminary Account of the Comparative Anatomy of the 

 Cerebellum. Proceedings of the Assoc, of American Anatom., 1897. 



4) Smith, G. Elliot, The Brain in the Edentata. Transact, of the 

 Linnean Soc. of London, Vol. 7, Part 7, 1899 — The Cerebellum, 

 p. 360—374. 



5) Wilder, Burt G., Article "Brain" in the "Reference Handbook of 

 the Medical Sciences", 1901, p. 157 — 161, contains references to 

 Stroud's "The Morphology of the Ape Cerebellum", Proceedings of 

 the Assoc, of Amer. Anatom., December, 1897, p. 107 — 126. 



