SUBORDER A 



PROSIMIA 



269 



emphasises the primitive structure of the dentition. In Jdapis, the per- 

 manent dentition has but two incisor teeth, while the milk dentition often 

 has three. The bones of the skeleton at present known agree best with those 

 of the Lemuridae. 



The genera pertaining to this family were embraced by Cope in the 

 Mesodonta, but he erroneously united with these the genus Anaptomorphus, 

 while Filhol erected the group Pachylemuridae for the genus Jdapis. Both 

 authors failed to give diagnoses for the divisions which they established. 



2.1.4.3. 



Pehjcodus Cope (Fig. 354). Dental formula : — 



2.1.4.3. 



Superior molars 



w m Tu' ji" ji^ fC ji' c I 



\ m T^, P- P- P' P'i '■ ' '': 



Fig. 355. 



Adapis parisiensis Cuvier. Upper Eocene (Pliospliorites), Quercy. A, Skull with lower jaw fro;n right side ; 

 B, from above. C, Grinding surface of upper teeth ; D, of lower teeth. 2/3. E, Astragalus, anterior and 

 posterior aspects. 1/1. 



quadrate, with two pyramidal external tubercles, a stout V-shaped protocone 

 and a weak hypocone ; intermediate tubercles very weak or wanting. Third 

 molar trigonodont, hypocone suppressed. Inferior molars with two pairs of 

 blunt opposite cusps and often with one weak single anterior tubercle. Third 

 molar with a cusp on the posterior border. The anterior half of the molar is 

 deeper than the posterior half. Premolars simple in structure. Astragalus 

 with tibial articular surface scarcely furrowed. Terminal phalanges claw- 

 shaped. Lower Eocene (Wasatch beds) ; Wyoming. F. tutus and fnujirorus 

 Cope. 



Cri/ptopithecus Schlosser. Only mandibles known. Fourth premolar short 

 but molariform. Molars with two deep anterior tubercles and low tricuspid 



