50 



B. Teeth encased in enamel: incisors (§; exceptionally, also two sup- 

 plementary posterior teeth,) continually reproduced from persistent pulps, 

 and growing in a circular direction: canines none: molars attypieally 

 with ridged surfaces. Lower jaw with condyles longitudinal, and not 

 received in special glenoid sockets, but gliding freely backwards and 

 forwards in longitudinal furrows. Members and feet ambulatorial. 

 Placenta discoidal deciduate. 



GLIRES. (XI.) 



C. Teeth (when developed) not encased in enamel: incisors typically 

 absent (lateral present in Dasypus): molars variable: members and feet 

 ambulatorial, (modified often for grasping and digging). Placenta diver- 

 siform (discoidal deciduate in Orycteropodidce and Dasypodiche; diffuse 

 deciduate in Manididoz; and coyledonous non-deciduate ? in Bradypo- 

 didce). 



BRUTA. (XII.) 



I. PRIMATES. 



SUB-ORDERS. 



I. Cerebrum with its posterior lobe much developed, wholly or mostly cover- 

 ing the cerebellum. Skull with lachrymal foramen within the orbit. 

 Orbit separated from temporal fossa by the union of the alisphenoid and 

 malar bones. Ears rounded, each with a distinct lobule. Female with 

 uterus undivided, and clitoris imperforate. Mammae (2) exclusively pec- 

 toral. 



ANTHROPOIDEA. 



II. Cerebrum with the posterior lobe not extended backwards over the entire 

 cerebellum, a considerable portion of the latter being uncovered. Skull 

 with lachrymal foramen outside the orbit. Orbits open behind, (partially 

 closed in Tarsiidae). Ears more or less produced upwards and pointed, 

 angulated at their extremities, with no distinct lobules. Female with 

 uterus two-horned, and the clitoris perforated by the urethra. Mammae 

 variable. 



PROSIMIAE. 



ANTHROPOIDEA. 



FAMILIES. 



I. Fore limbs withdrawn completely from the locomotive series, and trans- 

 ferred to the cephalic (Dana). Form habitually erect, except in infancy. 

 Feet with the great toe produced, and in same plane with others. Teeth 

 in an uninterrupted series. Hair scant. (Bimana.) 



HOMINIDAE. (I.) 



II. Fore limbs more or less employed in progression. Form prone, exception- 

 ally erect. Feet with the great toe more or less abbreviated, thumb-like, 



