494 ZOOLOGY. | 
incisors is occupied by several shorter teeth. The snout is very short, and 
the eyes still larger than in the galagos. The species are from the Moluccas 
and feed upon insects. 
The Monkeys (Simize) are divided into two groups or families, one ex- 
clusively peculiar to the Old, the other to the New World. 
Fam. 4. CEBIIDH (SIMLZ PLATYRRHINI), comprises the monkeys of the 
New World. ‘They have the nostrils directed laterally and outwards, placed 
at the side, and wide asunder, and are provided with three false molars on 
each side of both jaws. The thumb of the fore hands is not opposable to. 
the fingers, and is wanting very frequently. The cheek pouches and callo- 
sities are absent. The tail is long and always present, often prehensile, 
especially in those species that are destitute of thumbs. ‘The molars are 
six above and six beneath, on each side, a single case excepted, that is one 
more than the monkeys of the Old World. Cebiidz are confined to the 
warmer portions of the New World, from the Caribbean Sea to about the 
twenty-fifth degree of south latitude, and are especially numerous in those 
vast forests extending over the plains between the rivers Oronoco and 
Amazon. All of them are arboreal in their mode of life. 
The genus Hapale (ouistitis), like the majority of American monkeys, 
has a rounded head, a flat face, the buttocks hairy. They have only twenty 
molars, hke the monkeys of the Old World. ‘They have compressed and 
pointed nails, except to the hind thumbs; the thumbs of the anterior 
extremities are*but slightly separated from the fingers. They are pretty 
little creatures, with agreeable forms, which is seldom the case in monkeys, 
and are easily tamed. The name of Jacchus is restricted to those species 
whose inferior incisors are pointed and arranged on a curved line equal to 
the canines. The tail is annulated and well covered with hairs, the ears 
themselves being generally tufted. In those species in which the incisors 
are placed on a straight line and less than the canines, the name of Mydaus 
(tamarins) is applied. The tail is not annulated and more slender. 
The species are quite numerous, and spread all over the area occupied by 
the order. Twoare known in a fossil state, the remains of which are found 
in the diluvial deposits of Brazil. 
The genus Nyctipithecus (night monkeys) has a large and round head, a 
short snout, very small ears, and large approximating eyes. The tail is 
long, and covered with short hairs, not prehensile. The nails are all flat- 
A species lives in Guiana and Brazil. 
The genus Callithrix (squirrel monkeys) is distinguished by a tail very 
long and slender, but not prehensile. It has a general resemblance to the 
squirrels, from which it, however, greatly differs by the shape of the head. 
The ears are very large, the snout short, and the nostrils narrow. The 
animals of this genus are little and extremely light creatures, active during 
daytime and resting during night. Their food seems to consist more of 
insects, eggs, and small birds, than of fruits; and although habitually gentle 
and timid, they become animated even to ferocity at the sight of a living 
rey. 
; rf species of Callithrix has been found in a fossil state in South America. 
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