TIVE 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 
inasmall nail. The nails of the digits are, as in Lavgothrix, 
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. ‘he 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 ZLagothrix. 
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 
