53 
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. 
A. MYCETINAE. 
Aluatta Lac.=Mycetes Ill. 
B, CEBINAE. 
Ss Als 
Cebus Erxl. 
§. 2. 
Sapajou Lac.= Ateles Geoff. 
Eriodes I. Geoff.=Brachyteles Gray. 
Lagothrix Geoff. 
C, NYCTIPITHECINAE. 
eualc 
Nyctipithecus Spix=Aotus (Humb) Ill. (Inapplicable. ) 
§. 2. 
Callithrix Geoff. 
Saimiris Geoff., Gerv.==Chrysothrix Wagn. 
D. PITHECIINAE. 
Pithecia Desm. 
Chiropotes Ill., Gray. 
Brachyurus Spix=Ouakaria Gray. 
; Extinct Cebida. 
Protopithecus Lund. 
A poral 
ii 
