122 



MAMMALIAN DENTITION 



related and certainly the one is not derived from the other. 

 Their dentitions compared with each other and with that of 

 Parapithecus however show the general line of progress in 

 the dentition of Old-World Monkeys in all of which the dental 

 formula is: 



2 12 3 

 I-, Cy,P-,M|. total 32. 



Lasiopyga mona, the pretty Mona Guenon of West Africa 



Fig. 42. — Dentition of Mona Guenon (Lasiopyga mona, Schreber; 9.823-1). Ex- 

 ample of omnivorous dentition with a tendency toward the purely herbivorous adapta- 

 tion. 



(Fig. 42), although feeding largely upon fruits, leaves and 

 honey still retains a taste for fledglings and eggs. One finds 

 its dentition, therefore, though progressing considerably be- 

 yond that of Parapithecus along the herbivorous line, less spe- 

 cialized than that of the Baboon. Compared with that of Para- 

 pithecus the mandible of Lasiopyga is secondarily elongated 

 and the limbs of the dental arch instead of being divergent 



