780 
Genus.—Simia. 
Teeth—Canines much exceeding the others in length, and 
overlapping each other when the mouth is closed,—Two 
central incisors extremely broad. 
Head.—Muzzle projecting very considerably—Ears small, 
and placed close to the head. —Cheek-pouches none, 
Limbs.—Arms extremely long, the fingers resting on the 
ground when the animal stands erect. 
Habitat.—Borneo and Sumatra. 
Genus, —Siamanga. 
Head small, and muzzle short—Cheek-pouches none. 
Throat furnished with a large air-pouch. 
Limbs.—-Arms extremely long—First and second fingers 
of the hands united as far as the middle of the second joint 
—Slight callosities on hinder quarters. 
Habitat.—Sumatra. 
Genus.—Hylébates. 
Head, throat, and limbs, resembling Siamanga, except that 
the fingers of the hand are all free. Many systematic natu- 
ralists consider the two genera to be really one, and that the 
Siamanga is only a species of Hylobates. 
Habitat.—Malacca. 
Genus.—Presbf tes. 
Teeth.—Last molar of lower jaw with five tubercles. 
Head.—Muzzle very slightly produced—rudiments of 
cheek-pouches. 
Feet.—Elongated—Thumb of fore-feet very short. 
Tail—Extremely long, often surpassing the body. 
Habitat.—India, China, &c. Only known in Asia. 
Genus.—Célobus. 
Teeth - 
Head ? As in Presbytes. 
Tail 
Feet.—Thumb of fore-feet altogether wanting, or only 
represented by a small tubercle. 
Habitat.—Western Africa, 
Genus.—Cercopithécus, 
Teeth.—The last molar teeth of the lower jaw furnished 
with four tubercles. 
Head,— Cheek-pouches large — Face rather long and 
rounded. 
Tail.—Long, sometimes longer than the body. 
Habitat.—Spread over the greater part of Africa. 
Genus.—Cercocébus, 
Teeth.—The last molar teeth of the lower jaw furnished 
with five tubercles, the others with four tubercles. 
Head.—Muzzle more elongated than in Cereopithécus— 
Cheek-pouches large. 
Tail.—Long, and not tufted. 
Habitat.—Africa. 
Genus.—Macfacus. 
Similar to Cercocebus, excepting that the tail is very 
varied in length, several species being almost destitute of the 
member, and others possessing it very slightly developed. 
Habitat.—India, Sumatra, Japan, and the North of Africa. 
COMPENDIUM OF GENERIC DISTINCTIONS. 
Genus.—Silénus, 
Similar to the genus Macacus, excepting the tail, which is 
furnished with a conspicuous tuft of hair, 
Habitat.—India. 
Genus.—Cynoc€éphalus. 
Teeth.—Last molar of lower jaw furnished with one or two 
accessory tubercles, the others with four tubercles. 
Head.—Face lengthened into a conspicuous snout, and 
abruptly terminated, the nostrils being placed at the extre- 
mity—Cheek-pouches large. 
Tail.—Moderately long, and inserted high. In the Ge- 
lada it is furnished with a tuft, a peculiarity which has in- 
duced some writers to place the animal in a different genus. 
Habitat.—A frica. 
Genus.—Pfpio. 
Similar to Cynocephalus, excepting that the tail is ex- 
tremely small, and set nearly perpendicularly to the line of 
the back, 
Habitat.—Africa, 
Family.—C8BD&. 
Nostrils very wide, separated by a broad septum, opening 
laterally. Tail long, and in most instances prehensile. Thumb 
of fore-hands totally distinct from the fingers. Cheek- 
pouches absent. Molar teeth comparatively small. 
Genus.—Ateles. 
Head.—Rounded and small. 
Limbs,—Long and slender—Thumb of fore-hands wanting. 
Tail.—Prehensile, naked below towards the tip. 
Fur.—Long, stiff, and rather harsh. 
Habitat.—Brazils. 
Genus.—Brach ¥teles. 
Head as in Ateles. 
Limbs.—Thumb of fore-hands extremely small. 
Tail.—Prehensile, and naked below towards the tip. 
Fur.—Woolly. 
Habitat,—Tropical America. 
Genus.—Mycétes. 
Head.—Rather pyramidal—A Jarge beard on the cheeks 
and chin—Throat furnished with large, resonant pouch, 
formed by expansion of the hyoid bone. 
Limbs.—Fore-feet five-fingered. 
Tail.— Naked below towards the tip. 
Habitat. —Tropical America. 
Genus,—Cebus. 
Head.—Rounded. 
Tail.—Long, and entirely covered with hair. 
Habitat.—Tropical America. 
Genus.—Callithrix. 
Teeth.—Incisors straight, the two middle being broad— 
Canines short, hardly exceeding incisors. 
Tail.—Slender and rounded. 
Habitat.—Brazils. 
