172 



FOSSIL REMAINS OF MAN. 



In such a mammal as a Beaver (Fig. 29), a line {a. h.) 

 drawn through the bones, termed basioccipital, basisphe- 



BeavET. 



•IJentur; 



Fig. 29. — Longitudinal and vertical sections of the skulls of a Beaver 

 {Castor Canadensis), a Lemur (L. Catta), and a Baboon {Cynocephalus 

 Papio\ a 6, the basicranial axis ; h c, the occipital plane ; i T, the tentorial 

 plane ; a c?, the olfactory plane ; / e, the basifacial axis ; c 6 a, occipital 

 angle \ T % a, tentorial angle \ d a h, olfactory angle \ e f h, cranio-facial 

 angle ; g k, extreme length of the cavity which lodges the cerebral hemi- 

 spheres or ' cerebral length.' The length of the basicranial axis as to this 

 length, or, in other words, the proportional length of the line g hto that of 

 a b taken as 100, in the three skulls, is as follows : — Beaver 70 to 100 ; Le- 



