THE WOOLLY SPIDER-MONKEYS. 225 



Spider-Monkeys, to be presently described, and they pre- 

 sent also many resemblances to the foregoing species of the 

 Woolly Monkeys. Their limbs are long and slender, and their 

 body heavy, and covered with a woolly under-fur. Their head 

 is rounder than in the Capuchins. The face is flat, and the 

 facial angle large. The nose has the partition between the 

 nostrils narrower than in the other species of the family, and 

 the nostrils are themselves more approximated, circular in 

 form, and directed more downward than outward, thus show- 

 ing some approach to the position of the nostrils in the Old 

 World Apes. Their fore-limbs are long and slender, and the 

 thumb is often entirely absent (as in the Guerezas of Africa), or 

 there may be a very rudimentary digit, which sometimes ends 

 in a small nail. The nails of the digits are, as in Lai^othrix, 

 very compressed and sharp. The tail is longer than the body, 

 naked on the under side, and sensitive at its termination, and 

 therefore prehensile. 



The skull is globular, and the pre-maxillary bones articulate 

 with the nasal bones by a broad surface. The incisor teeth 

 are equal in size ; the canines are small, and of the same length 

 as the incisors, and the molars, which are vertically higher than 

 the canines, are thick and quadrangular. The lower jaw is 

 dilated behind, somewhat less than in Lagothrix. 



The Woolly Spider-Monkeys are very rare, and little is known 

 of their habits. They are confined to the south-eastern coast 

 forests of Brazil, that region to the south of Cape San Roque, 

 whence, as far as Rio Grande do Sul, ever-verdant forests, as Mr. 

 Wallace has described, clothe all the valleys and hills of the 

 lowland region, stretching as far west as the higher mountain 

 ranges parallel to the coast, and even up the valleys of the 

 larger rivers a long way into the interior of the country. 

 3~v. I Q 



