Marsh Collection^ Peabody Museum. 411 



as far at least as we are permitted to judge from their scant 

 remains, are closely related to Adapts and JVotharcttis, but 

 had made greater progress in the reduction of the premolars. 

 This gives an especially monkey-like appearance, pointing par- 

 ticularly in the direction of certain living Cebidse. It is proba- 

 ble, therefore, that all this series should be classified as primitive 

 members of a third section of the Anthropoidea. If this last 

 division represents a homogeneous and natural group, equivalent 

 in rank to that of the Arctopithecini and Paleopithecini, it is 

 deserving of a name, and I suggest for it that of Neopitheciui. 

 A summary of the foregoing discussion of the classification 

 of the Primates, together with the more technical definitions 

 of the several groups, is embodied in the following statement : 



Limbs elongate, with prehensile manus, and pes fully adapted 

 to an arboreal life ; incisors enlarged and in later forms becom- 

 ing reduced in number and rodent-like in pattern ; canines dis- 

 appearing in later forms ; an ossified tympanic bulla ; entocarotid 

 circulation as in the Galaginae and Lorisinse ; three families, 

 Microsyopsidse, Metacheiromyidge, and Cheiromyida?. 



Cheiromyoidea. 



Limbs elongate, prehensile, and adapted to an arboreal habit ; 

 incisors of lower jaw reduced in size, pectinate, and proclivous in 

 position; anterior lower premolar very generally enlarged and 

 functioning as a canine ; entocarotid canal not traversing the 

 petro-tympanic ; malar and lachrymal very generally in contact 

 on anterior rim of orbit ; fourth digit of the manus the longest 

 of the series ; three families, Lemuridaa, Indrisidse, and Nesopi- 

 thecidae. Lemuroidea. 



Limbs elongate, extremities prehensile, and fully adapted to 

 an arboreal life ; incisors and canines normal in form and posi- 

 tion ; entocarotid traversing petro-tympanic; malar and lachrymal 

 not in contact on anterior rim of orbit ; fourth digit of manus 

 shorter than third ; three superfamilies or groups, Arctopithecini, 

 Paleopithecini, and Neopithecini. Anthropoidea. 



The definitions and divisions of the superfamilies of the 

 Anthropoidea are as follows : 



Hallux and pollex of manus and pes not opposable ; true 

 molars reduced to two in each jaw ; one family, Hapalidse. 



Arctopithecini. 



Hallux and pollex fully opposable ; three true molars ; lachry- 

 mal enlarged, with well-developed pars facialis; lachrymal canal 

 opening without orbit ; premolars precociously reduced in highest 

 forms ; two families, Anaptomorphidse and Tarsiidse. 



Paleopithecini. 



