273 



Cerebral hemispheres do not cover cerebellum. Generally two 

 pectoral mammae ; and there may be additional teats on the 

 abdomen. Uterus bicornuate. Placenta non-deciduate (except 

 Tarsius). 

 Madagascar (chiefly), Africa, India, and Malay Archipelago. 



Give the Distinctive Features of the Anthropoidea. 



Cerebral hemispheres generally cover cerebellum. Cranial cavity 

 large. Orbit completely separated from, temporal fossa. Lachrymal 

 foramen is intra-orbital. Never more than two incisors on each 

 side of each jaw ; bunodont premolars (2 cusps) and molars (usually 

 4 cusps). Radius and ulna freely movable one on the other in prona- 

 tion and supination. Stomach usually simple. Uterus simple. 



Point out the Chief Differences between the Platyrrhini and the Catar- 

 rhini. 



Section Platyrrhini. 



A broad cartilaginous intemasal 

 septum. 



Tympanic bone simple, without a 

 bony tube (external auditory 

 meatus). 



A tympanic bulla. 



The orbital portion of the jugal 

 and the alisphenoid meet the 

 parietal, consequently the squa- 

 mosal does not join the frontal- 



|. 



Without cheek pouches. 

 Without ischial callosities. 



often prel 

 New World. 



See. Classification, page 265. 



Section Catarrhini. 



A narrow internasal septum. 

 Tympanic bone has a bony tube. 



Without a tympanic bulla. 

 The frontal meets the squamosal, 



consequently the jugal does 



not join the parietal. 



Two premolars gg- 



With cheek pouches (except 

 Apes). 



With ischial callosities (except 

 Orang-utan, Gorilla and Chim- 

 panzee). 



Tail not prehensile. 



Old World. 



See Classification, page 265. 



Write short Notes descriptive of the following : Hylobates, Simia 

 Gorilla, Anthropopithecus, Pithecanthropus. 



The slender Gibbons (Hylobates) have teeth closely resembling 

 those of Man ; and, like Man, they walk erect (when on the ground), 

 holding aloft their exceptionally long arms. They have flat nails 

 on the thumb and great toe only; and, unlike other Anthropoid 



T 



