Marsh Collection, Peabody Museum. 413 



anterior border, as in preceding family ; petro-tympanic bulla 

 little expanded behind ; no vaginal process ; auditory meatus not 

 prolonged into a tube ; carotid canal piercing bulla near postero- 

 internal angle ; a large floccular fossa on internal surface of 

 periotic ; postglenoid foramen present or absent ; muzzle abbrevi- 

 ated ; lachrymal either slightly extended beyond rim of orbit or 

 confined wholly within it ; ilium well expanded ; ischium without 

 distal enlargement and edges not everted ; head of femur with 

 well-defined neck and an open digital fossa; no third trochanter ; 

 an entepicondylar foramen of humerus ; hallux fully opposable ; 

 metatarsal of hallux without elongate proximal plantar extremity ; 

 pollex not as fully opposable as in higher species ; foramina of 

 atlas complex. . Cebidse. 



Premolars two above and below ; orbital and temporal fossse 

 separated by bony plate ; no parieto-sphenoid but a temporo- 

 frontal contact in the side wall of the cranium ; frontal and 

 alisphenoid not separated by malar on side wall of cranium ; 

 molars fully quadritubercular of squarish outline, without traces 

 of superior trigonal ridges, but tending to the formation of cross 

 crests ; first (third) inferior premolar with characteristic elonga- 

 tion of anterior border ; petro-tympanic bulla little inflated and 

 filled with cancellous tissue ; no vaginal process ; auditory meatus 

 prolonged into a bony tube ; carotid canal piercing bulla near 

 postero-internal angle ; a large floccular fossa on inner surface of 

 periotic ; presphenoid and basisphenoid remaining long distinct, 

 as in preceding family ; no postglenoid foramen ; muzzle abbre- 

 viated ; lachrymal never reaching rim of orbit, and of much 

 greater vertical than transverse extent ; ilium well expanded ; 

 ischium with distal enlargement and everted edges ; head of 

 femur with well-defined neck and an open digital fossa ; no third 

 trochanter; no entepicondylar foramen of humerus ; hallux fully 

 opposable ; metatarsal of hallux without elongate proximal 

 plantar extremity ; pollex fully opposable ; foramina of atlas 

 complex or simple. Cercopithecidae. 



Premolars two above and below ; canines enlarged and of 

 greater vertical extent than premolars and incisors, as in preced- 

 ing families ; orbital and temporal fossse distinct ; a temporo- 

 frontal contact on side wall of skull (except in Orang) ; frontal 

 and aiisphenoid not separated by malar on side wall of cranium ; 

 molars fully quadritubercular, with more or less rounded outline, 

 without any tendency to the formation of transverse crests, but 

 with distinct remains of superior trigonal ridges; first (third) 

 inferior premolar with traces of elongate anterior border (least 

 distinct in Chimpanzee) ; petro-tympanic bulla little inflated, 

 with a moderately well-developed vaginal process (except in 

 Hylobates) and no ossified styloid process as in preceding 

 families ; auditory meatus elongate ; carotid canal as in Cerco- 

 pithecidae ; floccular fossa on internal surface of periotic vestigial; 



