324 Monograph of the Genus Semnopithecus. 



Cercopitheci, as we have stated, this complex form of stomach 

 does not exist ; but on the contrary, we have reason to believe 

 that it obtains in the Colobi, as it does in the Semnopitheci ; 

 — and we anxiously wait the opportunity of dissecting a Co- 

 lobus, in order to put the point to the test. 



From what we have said, the general characters of the ge- 

 nus Semnopithecus, and the situation in which it stands among 

 the conterminous groups of the Simiadce, may be easily un- 

 derstood. On the latter point we may sum up our ideas by 

 observing that India presents us with the following forms of 

 Simiadce, — viz. the orangs, the gibbons, the Macaci, and the 

 Semnopitheci. Africa presents us with the chimpanzee, 

 ( Troglodytes), the Cynocephali, the magots, ( Inuus), the 

 Cercopitheci, the Cercocebi, if they deserve separation, and 

 the Colobi. The Macaci of India pass, by an easy transition 

 through the Macacus niger on the one hand, and the Barba- 

 ry ape, [Inuus sylvanus), on the other, into the Cynocephali, 

 or dog-faced race. The affinity of the orangs and chimpan- 

 zee, (though less immediate than has been imagined), is ne- 

 vertheless obvious ; the orangs naturally merge into the gib- 

 bons, and these approach nearer to the Semnopitheci than to 

 any other of the tailed monkeys ; the Semnopitheci are close- 

 ly linked to the Colobi, which may be regarded as binding 

 the Semnopitheci to the Cercopitheci, though approximating 

 more decidedly to the former group than to the latter, which, 

 through the species placed in the genus Cercocebus, links with 

 the Cynocephali. 



Two genera which we sink into that termed Semnopithecus., 

 require a passing notice, — we allude to Nasalis, Geoffrey, and 

 Lasiopyga, Illiger. The genus Nasalis contains two species, 

 the N. larvatus, Geoff, and the N. recurvus, Vig. and Horsf. 

 On the anatomy of the former species we have laid a few 

 statements before one of the scientific meetings of the Zoolo- 

 gical Society, the substance being as follows. Like the Sem- 

 nopitheci, the Nasalis larvatus has a complex stomach, an 

 intestinal canal of extraordinary length ; no cheek-pouches, 

 (notwithstanding M. Geoffroy's assertion), but a laryngeal 

 sacculus of enormous magnitude, undivided, and extending 

 below the clavicles ; a fifth tubercle on the last molar of the 

 lower jaw, and in fact a general similarity of structure to that 

 of the other species of the Semnopitheci, so that we know not 

 on what solid grounds it can be separated from the members 

 of that oriental genus. (See Zool. Proceed. 1837, p. 70). 



It may be advanced indeed that the form and develope- 

 ment of the nose, resembling to a certain extent the analo- 

 gous organ in the human subject, differs essentially from that 



