58 



IV. CEBIDAE. 



SUB-FAMILIES. 



I. Cerebrum with posterior lobe abbreviated, scarcely covering the cerebel- 

 lum behind. Hyoid bone and thyroid cartilage greatly developed : hyoid 

 bone expanded into a sub-globular drum, with thin osseous walls, the 

 larger cornua projecting backwards, the lesser obsolete. Incisors vertical. 



MYCETINAE. (A.) 



II. Cerebrum with posterior lobe enlarged, extending backwards much 

 beyond the cerebellum. Hyoid bone and thyroid cartilage moderate. 



A. Incisors vertical. 



1. Cerebrum with convolutions well marked. Tail more or less pre- 

 hensile. 



CEBINAE. (BJ 



2. Cerebrum with convolutions obsolete. Tail not prehensile. 



NYCTIPITHECINAE. ( C.) 



B. Incisors inclined forwards. Tail more or less abbreviated and bushy. 



PITHECIINAE. (D.f 



A. MYCETINAE. 



Aluatta La,o.=Mycetes 111. 



B. CEBINAE. 

 1. 



Cebus Erxl. 



.2. 



Sapajou 1i&c.=Ateles Geoff. 

 Eriodes I. Geoff. =Brachyteles Gray. 

 LagotJirix Geoff. 



C. NYCTIPITHECINAE. 

 . 1. 



Nyctipithecus Spix=ylo<us (Humb) 111. (Inapplicable.) 



.2. 



Callithrix Geoff. 

 Saimiris Geoff., Gerv.= Chrysothrix Wagn 



r>. PITHECIINAE. 

 Pithecia Desm. 

 Chiropotes 111., Gray. 

 Brachyurus Sp\x=0uakaria Gray. 



Extinct Cebida. 

 Protopill(tcu* Lnnd. 



