1 66 ALLEN'S NATURALIST'S LIBRARY. 



of the limbs pale grey ; the hands and feet black ; tail red, 

 the hair bushy at its base. Length of the body, 14 inches ; of 

 the tail, 13^ inches. (Weldon.) 



Caecum with dilated end; liver more divided than in C. 

 moloch ; the two halves (rami) of the lower jaw enormously 

 deep, resembling those of the Howlers (Mycetes). 



Distribution. Brazil ; Bahia, and the country between the 

 Parahyba and the mountains to the north of the Bay of Rio 

 de Janeiro. 



Habits. This species is very rare, and nothing is known of 

 its habits. 



Professor Weldon writes, in his paper in the " Proceedings 

 of the Zoological Society," referred to above : " Sir W. Flower 

 has suggested to me that the enormous depth of the ramus of 

 the mandibles in this Callithrix pointed to the existence of 

 some arrangement resembling that of Mycetes. It was difficult 

 to determine this point in a young female ; but the swollen 

 condition of the thyroid, together with the existence of a patch 

 of ossification on each side, seem to show the possible existence 

 of a howling apparatus in the male." 



THE DOUROUCOLIS. GENUS NYCTIPITHECUS. 

 jVyctipithecus, Spix, Sim. et Vespert. Bras., p. 24 (1823). 



The members of this genus, usually called "Douroucolis,"are 

 small animals, somewhat Lemurine in appearance, possessing a 

 short, thick body, a rounded head produced behind, and a 

 short, round face, encircled by a ruff of whitish fur. The 

 muzzle is not prominent ; the mouth and chin are small ; the 



