Size about as in the larger Gazelles. Form very peculiar, owing to the great elongation of the neck, which gives almost a Giraffe-like appearance to the animal. Limbs also very long; false hoofs quite minute. Colouring of the head less typically Gazelline than in _Ammodorcas_, but a modification of the light lateral body-line present. Skull (see fig. 85, p. 231) excessively long and low, the cranial part behind the horns particularly lengthened; the bones of this part very solid and stony. Bullæ low and opaque. A shallow anteorbital fossa present. Premaxillæ not reaching the nasals. Lower jaw slender and delicate. Premolars 3/3, the anterior one above almost as large as the second. Horns thick, oval in section, very closely ringed, curved backwards as in many species of _Gazella_ for the greater part of their length, their middle portion more or less lyrate, as in _Gazella dorcas_, their tips recurved upwards or forwards. Female hornless. _Range of the Genus._ Somaliland and British East Africa. One species only. [Illustration: THE BOOK OF ANTELOPES, PL. LXXIV. _J Smit del et lith._ _Hanhart imp._ The Gerenuk. LITHOCRANIUS WALLERI. _Published by R H Porter._] 108. THE GERENUK. LITHOCRANIUS WALLERI (BROOKE). [PLATE LXXIV.] _Gazella walleri_, =Brooke=, P. Z. S. 1878, p. 929, pl. lvi. (skull); =Scl.= P. Z. S. 1884, p. 538, pl. xlix. (head and skin); =Phillips=, P. Z. S. 1885, p. 931; =Scl.= in James’s Unknown Horn of Africa, p. 262, pl. i. (1888); =Hunter=, in Willoughby’s E. Afr. p. 289 (1889); =Flow. & Lyd.= Mamm. p. 342 (1891); =Inverarity=, Journ. Bombay N. H. Soc. vi. p. 459 (1891). _Lit(h)ocranius (Gazella) walleri_, =Kohl=, Ann. Mus. Wien, i. p. 79, pl. v. fig. 3, and pl. vi. fig. 1 (skull) (1886) (Somaliland). _Lithocranius walleri_, =Thos.= P. Z. S. 1891, p. 207; =Scl.= P. Z. S. 1892, p. 101; =Swayne=, P. Z. S. 1892, p. 305; =Ward=, Horn Meas. (1) p. 134 (1892), (2) p. 175 (1896); =Lyd.= Horns and Hoofs, p. 241 (1893); =Jackson=, in Badminton Big Game Shooting, i. p. 307 (head) (1894); =Scl.= P. Z. S. 1893, pp. 101 & 118; =Swayne=, P. Z. S. 1895, p. 305 (habits); =id.= Seventeen Trips to Somaliland, p. 312 (1895); =Matsch.= Säug. Deutsch-O.-Afr. p. 132 (1895); =Hoyos=, Zu den Aulihan, p. 180, pl. x. fig. 4 (1895); =Thos.= Ann. Mus. Genov. (2) xvii. p. 107 (1896); =Rhoads=, P. Ac. Philad. 1896, p. 519; =Elliot=, Publ. Chicago Mus. Zool. i. p. 226 (1897). VERNACULAR NAME:--_Gerenuk_ of Somalis (_Swayne and others_).