CEBID.£E Far 
Family CEBID-E. 
2 
Dentition: ¢ 2, ¢ 4. p 3, m &; total 36. Tail frequently 
prehensile : digits with nails: other characters as in the Huapalide. 
The members of this American family are at once distinguished 
by the dental formula, which is numerically higher than in any 
other Apes. The various species range over the whole of tropical 
America, but are most abundant in the dense forest regions 
of Brazil, where they live a completely arboreal life, to which the 
prehensile tails of many of them are so specially adapted. They 
are In most respects closely 
allied to the Hapalidr, but 
the pollex diverges some- 
what from the plane of the 
other digits : while the re- 
tention of the third molar 
is a very distinctive feature. 
None of the species attain 
the dimensions of the larger 
Ceorupithectde of the Old 
World. The genera are 
usually arranged in five 
subfamilies. 
Subfamily Myecetinse.— 
Lower incisors vertical : 
hyoid bones enormously 
inflated ; tail long and pre- 
hensile, naked beneath at 
the end; pollex well de 
veloped. 
Uyectes4—The sole re- 
presentatives of this sub- 
family are the well-known 
Howling Monkeys, all of 
which are included in the = 
genus JM yoctes, They are Fie. 388. Side view of skull and hyoid bone of the 
of more bulky build, and Red Howling Monkey (Mucetus seniculus), From De 
have more produced muzzles P"""* 
than the other members of the family. The truncated occipital 
region, and the extraordinary development of the rami of the 
mandible, especially of their angular and ascending portions, are 
the chief peculiarities by which the skulls (Fig. 338) of the 
members of this genus are characterised. The last named char- 
acter, which is more marked in the male than in the female sex, 
1 Wliger, Prodromus Sust. Mamin, ef Avi, p. 70 (1811). 
