Fam. CEBIDÆ. Chrysothrix -- -- [+] -- Protopithecus -- -- -- [+] Callithrix -- -- [+] [+] Nyctipithecus -- -- [+] -- {228} Brachyurus -- -- [+] -- Pithecia -- -- [+] -- Alouatta -- -- [+] [+] Cebus -- -- [+] [+] Homunculus -- -- -- [+] Anthropops -- -- -- [+] Lagothrix -- -- [+] -- Brachyteles -- -- [+] -- Ateles -- -- [+] -- Fam. CERCOPITHECIDÆ. Papio [+] [+] -- -- Theropithecus [+] -- -- -- Cynopithecus [+] -- -- -- Oreopithecus -- [+] -- -- Macacus [+] [+] -- -- Cercocebus [+] -- -- -- Cercopithecus [+] -- -- -- Dolichopithecus -- [+] -- -- Mesopithecus -- [+] -- -- Colobus [+] [+] -- -- Semnopithecus [+] [+] -- -- Nasalis [+] -- -- -- Fam. SIMIIDÆ. {229} Pliopithecus -- [+] -- -- Hylobates [+] [+] -- -- Dryopithecus -- [+] -- -- Simia [+] [+] -- -- Gorilla [+] -- -- -- Anthropopithecus [+] [+] -- -- It will be apparent from the above tables that, while the living _Lemuroidea_ are confined to the Eastern Hemisphere, in past times some genera were not only common to both Hemispheres, but the Order was equally well, if not indeed better, represented in the New, than in the Old, World. Among the _Anthropoidea_, on the other hand, then, as now, none of the genera were common to both Hemispheres; and a large number of the genera, which then existed, were identical with genera now living, to a greater extent than among the _Lemuroidea_. II. Tables to illustrate the distribution of the genera of Primates in time, in the different Zoo-Geographical Regions into which the World has been divided. {230}_A._ PALÆARCTIC REGION. Column headings L: Lower. M: Middle. U: Upper. P: Pleistocene. R: Recent. G: Genus. S: Species.