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COMPENDIUM OF GENERIC DISTINCTIONS. 



Genus, Sfmi. Genus. Silenus. 



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 Hylobates. 



Head, throat, and limbs, resembling Siamanga, 

 except that the fingers of the hand are all free. 

 Many systematic naturalists consider the two genera 

 to be really one, and that the Siamanga is only a 

 species of Hylobates. 



Habitat. Malacca. 



Genus. Presby"tes. 



Teeth. Last molar of lower jaw with five tuber- 

 cles. 



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, etc. Only known in 

 Asia. 



Genus. C 61obus. 



Teeth ) 



Head > As in Presby"tes. 



Tail ) 



Feet. Thumb of fore-feet altogether wanting, or 

 only represented by a small tubercle. 



Habitat. Western Africa. 



Genus. Cercopithecus. 



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. Cercocebus. 



Teeth. The last molar teeth of the lower jaw 

 furnished with five tubercles, the others with four 

 tubercles. 



Head. Muzzle more elongated than in Cerco- 

 pithecus Cheek-pouches large. 



Tail. Long, and not tufted. 



Habitat. Africa. 



Genus. Macacus. 



Similar to Cerocebus, 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. 



Similar to the genus Macacus, excepting the tail, 

 which is furnished with a conspicuous tuft of hair. 

 Habitat. India. 



Genus. Cynocephalus. 



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 extremity Cheek pouches large. 



Tail. Moderately long, and inserted high. In 

 the Gelada it is furnished with a tuft, a peculiarity 

 which has induced some writers to place the animal 

 in a different genus. 



Habitat. Africa. 



Genus. Papio. 



Similar to Cynocephalus, excepting that the tail 

 is extremely small, and set nearly perpendicularly to 

 the line of the back. 



Habitat. Africa. 



Family. C^BID^;. 



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. A teles. 



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. Brachyteles. 



Head as in A teles. 



Limbs. Thumb of fore-hands extremely small. 

 Tail. Prehensile, and naked below towards the 

 tip. 



Fur. Woolly. 



Habitat. Tropical America. 



Genus. Mycetes. 



Head. Rather pyramidal A large beard on the 

 cheeks and chin Throat furnished with large, re- 

 sonant 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. C allithrix. 



Teeth. Incisors straight, the two middle being 

 broad Canines short, hardly exceeding incisors. 

 Tail. Slender and rounded. 

 Habitat. Brazils. 



