CHAP. Ill] THE MAMMALIAN ORDER PRIMATES 



53 



Lachrymal foramen : this is situated within the orbital margin. 

 Hyoid bone : the posterior cornu exceeds the anterior cornu in 



size 



Colon : not looped as in Lemuroidea. (Cf. Fig. 22 with Fig. 19.) 



Brain: cerebral hemispheres much convoluted and prolonged 

 backwards to cover the cerebellum to a considerable extent (Figs. 

 23, 24 and 25) : rhinencephalon much reduced. 



Mammae : two in number and thoracic in position. 



Uterus : this has no cornua properly so called : Fallopian tubes 

 spring directly from the body of the uterus. 



Placenta : this is deciduate and meta-discoidal. 



Family I. Hapalidae 1 . 



Dental formula : i, f ; c, \ ; pm, f ; m, § = 32. 

 Pollex : not opposable. 



Sphenoparietal 

 articulation 



Lacrymo-ethmoidal 

 articulation 



^.Panelo-malar 

 5C articulation 



Fig. 26. Cranium, with mandible, of Hapale jacchus (Hapalidae). Note the 

 auditory bulla, the spheno-parietal articulation and in the orbit the lachrymo- 

 ethmoidal articulation ; two molar teeth are seen in each jaw, and the incisor 

 teeth project strongly ({). 



Digits : bear claws, no nails : the hallux is an exception to this 

 rule. 



Cheek pouches : not developed. 



Ischial callosities : not developed. 



External auditory meatus : not prolonged into an osseous tube. 

 (Cf. Fig. 26.) 



1 (Hapale : from a Greek word indicative either of minute size, or docile 

 temperament.) 



