366 PHYSIOLOGICAL SERIES. 



The tuberculum acusticum and the trapezoid body are 

 very large. 



The cerebellum conforms to the simple, common mam- 

 malian typo such as is presented by Tamanduas, for example. 

 Tho details of this common fundamental plan have been 

 demonstrated by a series of six diagrams in the case of 

 Cabastmu (figs. 79, 80, 82, 83, 84, and 85). The floccular 

 lobes are built-up on the same plan in Daubentonia y but the 

 dorsal part of the paraflocculus (comp. fig. 83, PARAFLOC.D.) 

 is much the largest part of the lobe. From the anterior 

 part of the paraflocculus a prominent " petrosal lobule " 

 projects into a fossa in the petrous temporal. 



In comparison with the simple cerebellum of Cabassous 

 there is a noteworthy expansion (fig. 206) of the region 

 labelled " area B " in this Armadillo's brain (figs. 82 and 

 85). Such a development also occurs in the Anteaters, 

 Carnivores, and many other mammals. 



Considered as a whole, the brain of the Aye-aye exhibits 

 a curious blending of many of the features of the Lemur's 

 brain and those of most non-Primate mammals, and more 

 especially those of the Sloths, Anteaters, and Pangolins. 



Oudemans, Nat. Verb. Akad. Amsterdam, 1890, p. 26. 



Chudzinsky, Bull. Soc. d'Anthrop., t. vii. 1896, p. 12. 



Family LEMUKJDJZ. 



D. 533. The brain of a Ruffed Lemur (Lemur varius), (?) 

 (figs. 210, 211, 21 2 & 213). 



The brain of the Lemurs is of great interest in that it 

 exhibits features which undoubtedly indicate its genetic 

 atlinity to the brain of the Apes, and at the same time 

 -hows characters which allow an accurate comparison to be 

 instituted with the organ of Daubentonia and of the lowlier 

 mammalian Orders*. As in Daubentonia, the ccn-brllmn 

 is almost wholly uncovered in the adult. 



* By this I do not mean to imply that the Lemurs, or even Daubent <//. 

 are primitive types (because there is much to suggest that they are to Mimr 

 extent reversionary) ; but they certainly permit accurate conipari.Mins to be 

 instituted with the lowlier mammals more readily than do the Anthropoidea. 



