CHAP. Ill] THE MAMMALIAN ORDER PRIMATES 



49 



SUB-ORDER 

 ANTHROPOIDEA 



Most highly organised Primates, chiefly modified for and adapted 

 to an arboreal mode of life. 



Teeth : the ujDper median incisor teeth are in contact with one 

 another. 



Digits : these are provided with flat nails (except in the Hapa- 

 lidae). 



Spheno-pariefal 



articulation 



iver 



Stomach 



Caec 



Fig. 21. 



Fig. 22. 



Fig. 21. Cranium, with mandible, of Cebus capucinus (Cebidae). Note the 

 auditory bulla, and shallow auditory passage ; the spheno-parietal and lachrymo- 

 ethmoidal articulations, the latter suture being marked by a small circle ; three 

 molar teeth are seen in each jaw. 



Fig. 22. Part of the alimentary canal of a Cercopithecus monkey (Cercopithe- 

 cidae) ; note the lack of contortion in the colon, and the absence of an appendix 

 caeci. 



Pollex : in a few instances is rudimentary or absent, in most it 

 is well developed. 



Orbit : the post-orbital boundary is a bony wall extending 

 inwards from the post-orbital ring, and separating the orbit from 

 the temporal fossa. (Cf. Fig. 21.) 



D. M. 



