HYI.OBATKS. 25, 



I. The skull of an adult male. Sumatra. No. 3C of Blyth's 

 Catalogue : described by Pearson as S. gigantica, Journ. As. 

 See. Bengal, Vol. X, p. 660, and the measurements given by 

 Mr.Blyth, op. eit., Vol. XXII, p. 380, tab. No. 2, and figured 

 I. c, Plates I iind II. The skull is much more massive than 

 any of the skulls of S. iatyrus and distinguished from them 

 by the great depth of the malo-m axillary area, which is 

 flat and much, expanded, and measures 2 inches in height, 

 whereas in the skulls referred to S. satyrus it is seldom above 

 1""42 in depth. The muzzle also is very powerful, and, the 

 canine ridges enormous. The breadth across the front of the 

 orbital region is greater than in the foregoing skulls of 

 S. satyrus, and the superciliary ridges are much more deve- 

 loped. The orbits are irregularly vertically oval, The tem- 

 poral ridges are strongly marked and form a prominent 

 sagittal ridge. The zygomatic arch is strong, and the 

 lower jaw very massive, with a broad ascending ramus. This 

 skull corresponds so closely to the figure of the skull described 

 by Professor Owen* that there can be no doubt of their spe- 

 cific identity. 



II.— Sob-Family HYLOBATIN^. 

 Genus HTLOBATES, lUiger, 1811. 



5. Hylobates syndactylus. 



SJmia Syndactylus, Raffles, Trans. Limn. Soc, vol. xiii, 1822, p. 241. 



Pithecus syndactylus, Desmarest, Mamm., 1820, p. 531. 



Hylobates syndactylus, F, Cuv., Mist. Nat. des Mammif. livr°. xxxiv, 



Novembre 1821. 

 Siamanga syndactyla, Gray, Cat. Mamm. B. M., 1843, p. 1. 

 Hylobates (Siamanga) syndactylus, Anderson, Anat. and Zool. BescJi., 



and West, Yunnan Expd., 1878, p. 10. 



Hah. Sumatra and Malayan Peninsula. 



5a. A young male stufied : its skull and the bones of its 

 trunk. Presented by W. Rutledge, Esq., 24th June 1873. 



h. The skin of an adult female and the bones of its trunk. 

 Presented by W. Rutledge, Esq., 24th June 1873. 



c. A young male stuffed, and its skull and the bones of its 

 trunk. Presented by W. Rutledge, Esq., 16th August 1873. 



Mr. Blyth distinctly mentions that the skin of Dr. Clarke Abel's specimen 

 possessed cheek excrescences, but less developed than in the Bornean male 

 (Journ. As. Soc. Beng., Vol. XXII, 1853, p. 370). 



' Trans. Zoological Soc. Vol. I, 1835, PI. 53. 



