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Show 1870.] ANATOMY OF THE PRONGBUCK. 339 family. Still I am far from the opinion that it will long remain in solitary grandeur ; for I am convinced that its more aberrant features are but bridges, tbe further connecting end of which temporarily appears hazy to us from our present circumscribed point of view. I append such characters (see also Gray and Turner) of the limited group in question as at present appear to me reliable from the known data. I coincide with Messrs. Sclater and Gray as to the family value of the periodically deciduous horns, but do not agree with the former authority (A. N. H. p. 403) in recognizing absence of false hoofs as peculiar to the Giraffe and Prongbuck. Dr. Gray explicitly states of the Steinbok, " False hoofs none" (Cat. M a m. Brit. Mus. " Furcipeda," 1852, p. 71); and specimens which I have examined enable m e to corroborate this assertion. Family ANTILOCAPRIDEE, Sclater. Horns hollow, forked, and periodically deciduous. Dentition.-I. g . C. g . P.M.gCorg?). M. £1= 32 (or 36?). Genus A N T I L O C A P R A , Gray. Horns in o" and $ , supraorbital; core osseous and cancellated; sheath semicorneous, with agglutinated hairs. False hoofs none. Cutaneous glands caprine ; crumen absent. Nose ovine, hairy. Skull cervine in form ; no suborbital depression ; fissure wide, lengthened ; supraorbital foramen large ; nasals furcate, widest posteriorly ; orbit slightly elevated above face ; masseteric ridge low ; auditory bullae moderate, compressed, angular ; supraoccipital perpendicular and concave ; basioccipital tubercles abortive ; styloid en-sheathed ; glenoideum convex. Mandibular angle widely rounded. Appendicular skeleton relatively slender. A gall-bladder. Larynx without internal pouching ; and thyroid cartilages not prominent. Cowper's glands absent; prostate bifid. Incisors subequal, sloping ; molars without supplemental lobes. Hab. California. 3. OBSERVATIONS ON EXTERIOR POINTS. The outward zoological characters of the Prongbuck have been accurately commented on by C. Hamilton Smith*, Richardsonf, Gray|, Audubon and Bachman§, Cassin ||, and others, and good figures of the animal and of the horns given by several of the above writers. The talented pencil of Mr. Wolf has also delineated the Society's specimen while it lived in the Gardens (see P. Z. S. 1867, pl. XVII.). Stuffed skins of the horned male and female and of the * Trans. Linn. Soc. vol. xiii. p. 13, tab. 2. f Loc. cit. p. 266, pl. 21. j Knowsley Menagerie, 19. § Quadrupeds of N. America, vol. ii. p. 493, pl. lxxvii. j| U. S. Explor. Exped. vol. viii. p. 667 (1853-56). |