tliE GtTEREZAS. 85 



most molar on each side has five cusps to its crown. Their 

 breast-bone is very narrow. The vertebrae forming the tail are 

 much elongated. All have the central {os centrale) bone in the 

 carpus (or wrist). 



The posterior lobes of the cerebrum project beyond the 

 cerebellum and conceal it ; they are very short among the 

 Langurs. The principal grooves and foldings seen in the 

 human brain are represented, and there is a perfectly distinct 

 hippoca)npus minor — an eminence in the cavity of the posterior 

 lobe, which was for a long time supposed to be a character 

 peculiar to the human brain, and the presence or absence of 

 which was once a celebrated cause of difference between certain 

 distinguished anatomists. 



The food of the Semtiopithecuice — of which they consume a 

 large bulk at a time — consists chiefly of leaves and young 

 shoots of trees. For this purpose their sacculated stomach 

 forms a necessary receptacle and store for their food during 

 their hasty collection of it. 



The Sub-family practically consists of but two genera — ■ 

 — Colobus and Senuwpithccus. One species, forming a third 

 genus {Nasalis)^ is closely related to the latter. The Colobi 

 are confined to Africa, and the Seninopithecl — of which there 

 are a large number of species — inhabit the mainland of India, 

 the Malayan Peninsula, and the neighbouring Archipelago as 

 far east only as Wallace's line, which runs between the islands 

 of LJali and Lombock, and northwards to the east of Borneo. 



THE GUEREZAS. GENUS COLOBUS. 

 Colobus, lUiger, Prodr. Syst. Mamm., p. 69 (181 1). 

 The Guerezas are a group of Monkeys entirely confined to 

 the African continent. The character which especially dis- 



