PRESBYTIS. 3 



the best known is Hylobates hoolook, found in the forests and hill ranges 

 of Assam, Sylhet, Cachar, &c., whose extraordinary howlings I have 

 heard in the Khasia hills and in Cachar ; Hylobates lar occurs in 

 Tenasserim, and H. agilis in the Malayan peninsula, and there are 

 several other species from the Malayan islands. They are of small size, 

 gentle in disposition, and progress on the ground on their hind legs in a 

 series of hops or jumps sideways, with their arms raised erect. 



MONKEYS. 



The Entellus group of monkeys are placed by Mr. Blyth in a sub- 

 family, COLOBIN^E, along with an African genus, Colobus. They are 

 distinguished from the other monkeys and baboons, by wanting the 

 cheek-pouches, and having a peculiar sacculated stomach. 



Gen. PKESBYTIS, Illiger. 

 Syn. Semnopithecus, F. Cuvier. Langur, H. ffunumdn, of Hindus. 



Char. Cheek-pouches rudimentary or wanting ; head round, the face 

 but little produced, having a high facial angle. The last molar tooth of 

 the lower jaw, with a fifth or accessory tubercle behind ; canines much 

 longer than the incisors ; extremities and feet long ; fore-feet with the 

 thumb short, and the third and fourth fingers long and sub-equal. Tail 

 very long, slender, and straight. Callosities present. Peculiar to the 

 Indian region. 



The body of these monkeys is comparatively slender, and the Germans 

 call them slim-apes. Their long and slender limbs, long tail, and the 

 black face with an eyebrow of long stiff black hairs, pointing forwards, 

 distinguish the Langur s from all other monkeys. The absence of the 

 cheek-pouch appears to be in some measure compensated by a peculiar 

 sacculated stomach, described fully by Owen, in the 1st Vol. "Trans- 

 actions of the Zoological Society " ; several distinct sacs or pouches being 

 added to and communicating with the stomach. In a specimen of P. 

 entellus, 20 inches long to the root of the tail, the small intestines were 

 13^ feet long, the large ones 2 feet 10 inches, and the coacum 4 inches. 

 The distended stomach measured 31 inches along the greater curve, and 

 was 1 foot in circumference. It consisted, firstly, of a simple cardiac 

 pouch ; secondly, of a wide and sacculated middle portion ; and thirdly, 

 of a narrow lengthened canal, sacculated at first, and simple afterwards, 

 vascular, and the true digestive stomach. Owen in this paper, asks if 



B 2 



