560 DOROUCOULIS 



that of j\ryv€tr^. Nevertheless Professor Weklou^ has found in 

 a female of C. (jigot a patcli of ossiiication on the thyroid cartilage 

 of the larynx wliich may be an indication of sometliing more in 

 the male. There are eleven species. 



NyctipWiecHs, the Doroucouli Monkeys, is a genus of some- 

 what Lemuriue appearance, caused by their large eyes. But they 

 reminded liates of an Owl or a Tiger-cat ! They have a long, but 

 not prehensile tail. As in tlie Marmosets, the lower incisors 

 project forwards in a Lemurine fashion. The tliumb is very 

 short. A peculiarity of tliis genus is the twenty -two dorso- 

 lumbar vertel»rae. As in Clirysotlirix, but not as in Oallithrix, 

 the hemispheres of the brain are smooth. There are five species, 

 of which one occurs so far north as Nicaragua ; the rest are 

 Brazilian, extending down to the Argentine. 



The Ouakari Monkeys, Brachynrus'^ are, as the name denotes, 

 short -tailed forms. Two species, B. r%tbic%inchis and B. calvus, 



-^f ^' ^y 



^^ 

 Fig. 266. — ried-fnrcil Ouakari. BracJii/nri's ntbicinidus. x i. 



have bright red faces ; B. melarioceplialvs has a black one. 

 There is a small thumb. The brain is fairly convoluted, and is 

 to be specially compared with that of Cehus and Pithecia. The 



^ "Notes on Ca.IUthrix gigot," Proc. Zool. Soc. 1884, p. 6. 

 - Forbes, Proc. Zool. Soc. 1880, p. 639. 



