FIG. 29. Longitudinal and verticil sections of the skulls of 

 a Beaver (Castor Canadensis} y a Lemur (L. Catta\ and a Baboon 

 (Cynoccphalus Papio), a b, the basicranial axis ; b c, the occipital 

 plane j i T t the tentorial plane ; a d, the olfactory plane ; / e, 

 the basifacial axis ; cba, occipital angle ; Tia, tentorial angle ; 

 dab, olfactory angle ; efb, cranio-facial angle ; g h, extreme 

 length of the cavity which lodges the cerebral hemispheres or 

 " cerebral length." The length of the basicranial axis as to this 

 length, or, in other words, the proportional length of the line 

 g h to that of a b taken as 100, in the three skulls, is as 



177 



