Bcavtr. 



Ltmur. 



Fig. 29. — Longitudinal and vertical sections of the 

 skulls of a Beaver (Castor Canadensis), a Lemur (L. 

 Catta), and a Baboon (Ci/nocrphalus Papio), a b, the 

 basicranial axis; & c, the occipital plane; i T, the tentorial 

 plane; a d, the olfactory plane; f e, the basifacial axis; 

 c b a, occipital angle; Tia, tentorial angle; dab, olfac- 

 tory angle; e f b, craniofacial 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 



