436 W. K. GREGORY NOTHARCTCS AND LEMUROIDEA 



6. Ectotympaiiic enlarged, external to bulla, forming its outer wall and 



sometimes continued externally into a tubular meatus. 



7. Stapedial branch of internal carotid reduced. 



8. Main branch of internal carotid entering brain-case in front of bulla. 



9. Placenta diffuse adeciduous (so far as known), 



10. Digit IV of manus usually the longest. 



11. Disrit II of manus more or less reduced. 



■'to* 



Family Lorisidae Gray 



9 j^ 3 3 



Dental formula : I^' C— ' P— ' M—- 



Anterior pair of upper incisors more or less separated, of medium to 



minute size. 

 Lateral upper incisors placed more or less laterally to median pair. 

 Upper canines more or less dagger-shaped; much larger than incisors 



(near anterior end of tooth row). 

 Lower canines compressed, sharply procumbent, and incisiform. 

 Pm, more or less enlarged and caniniform. 



Pm^ varying in form, often enlarged; Pm* bicuspid or tricuspid. 

 M^, M^ tritubercular with cingulum-hypocone ; no mesostyle. 

 Lower molars with paracone reduced or absent. 

 Mastoids much inflated, broadly continuous with bulla. (Mastoid sinus 



in wide communication with medial sinus of bulla). 

 Occiput more or less flattened. 



Subfamily Lorisinae 



Eecent : Southeastern Asia and West iVfrica. 



Climbing arboreal animals with short calcaneum and navicular, hind legs 

 slender and not much longer than fore legs, short lumbar para- 

 pophyses, and short tail. Fenmr with vestigial third trochanter. 



Spines of twelfth and thirteenth dorsal vertebrae directed backward. 



Spines of cervical and first dorsal vertebra elongate. 



Skull strongly brachycephalic, with much widened occiput. 



Orbits directed forward. 



Postorbital process of malar wide. 



Zygomata stout; proximal end of zygomatic branch of squamosal con- 

 tinuous with external auditory meatus. 



Posterior nares usually behind va^. 



Pm* small, bicuspid, with one external cusp ; hypocone reduced or absent. 



Genera : Perodicticus, Artocebus, Nycticehus, Loris. 



