The Catarrhini

3. The Catarrhini.-The Simiadae of this division present a great range of variation in most respects, but they agree in having the partition between the nostrils narrower than in the Platyrrhini; in possessing a bony meatus auditorius; in the dental formula i. 2.2/2.2 c. 1.1/1.1 pm. 2.2/2.2 m. 3.3/3.3 and in being inhabitants of the Old World. They fall into two very distinct groups, the Cynomorpha and the Anthropomorpha.