MOKPHOLOGT OF TIIK HRAIX I\ Till-: >r.\ MM ALIA. 



427 



homologies of the various parts than was the case when I was discussing sucli widt'ly 

 separated mammals as the Edentates and Man. 



Fig. 63. 



fs. 



uv. 



no. 



Lemur macaco. 

 Diiigrara representing- a mesial sagittal section of tlio cerebellum. x 2. 



The accompanying series of drawings (figs.G4« to (/) representing mesial sagittal sections 

 through the cerebellum in Tursius, in the Insectivore Erluucens, in the Marsupial 

 Perameles (the pattern of which is identical with that of the Insectivore Ilacroscelldcs), 

 and in the Marsupial Notoryctes (the simplest cerebellum in the Mammalia), will serve 

 to indicate the dilfercnt manner in which essentially the same pattern becomes 

 elaborated in detail. 



-':f3. 



id ) fi.o. 



Diagrams representing corresponding sections in (a) Tarsiii'!, X 4 ; (b) Ennaci'MS, x 4 ; 

 (c) Peniine/es, x 4 ; and (d) Xotori/ctes, x 8. 



Such variations of the same simple plan might be adduced almost without limit front 

 among the small Insectivora, Marsupialia, Chiroptera, Rodentia, and Edentata, but a 

 comparison of Tarsliis with a small Insectivore and a Marsupial will suffice to explain 

 the general principle. 



