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Show 1868.] DR. J. E. GRAY ON THE SU1D/E. 45 lated, with a produced lower edge, making the skull appear higher than the skull from an animal with all its teeth iust developed, as 720A. J ^ 2. DICOTYLES. Skull-side of the face in front and on the under side of the orbits flattened, with a well-marked ridge on its lower edge; orbits small, incomplete. The longitudinal ridge on the cheeks bent up in an arched manner in front of the orbits, and then slightly indicated parallel to the line of the forehead, becoming a large concavity on the cheek beneath. Teeth large (see Blainv. Osteogr. Onguligr. Sus, t. 5, figured as Sus torquatus). Tail rudimentary ; caudal vertebrae nine (Gerrard). DICOTYLES LABIATUS. B.M. Black-brown, varied with yellowish ; no neck-bands; lower jaw white. Sus tajassu, Erxleb. S. Reg. Anim. i. 185. Sus albirostris, Illig., Licht. Verz. d. Doubl. Berl. Mus. 3. Dicotyles labiatus, Cuv.R.A. i. 237; F.Cuv. Dent. M a m m . 210, t. 86. f. 2; M a m m . Lith. xxvii. t.; P. Z. S. 1848, p. 70, 1860, p. 262. Sus labiatus, Gerrard, Cat. Bones B. M . 281 ; Blainv. Osteogr. Onguligr. t. 3 (foot). Dicotyles albirostris, Wagner, Schreb. Saugeth. Suppl. iv. 306 ; P. Z. S. 1860, pp. 262, 442, 443. D. torquatus, Blainv. Osteogr. Sus, t. 5 (skull). Cache, Oviedo, H. N. de las Indias, p. 21. Saynos, Acosta, H. N. de las Indias, p. 287. Tayacutericus, Laet. Nov. Orb. 551. Tagnicati, Azara, Paraguay, i. 25. Pfab. South America; Guiana, Brazil, Paraguay, Peru. The skulls are shorter, and the ridge on the cheek is not so large and distinctly marked in younger animals as in the adults. The alveolus for the hinder grinders, which are about to be developed, is a kind of sheath with a slit along the middle of its exposed side. The skulls of the young animals changing their teeth sometimes show two small conical canines on each side of the upper jaw, as 721 a, 721b. II. The premolars deciduous, their place being supplied by the development of the molars. Fam. 3. PHACOCHCERIDAE. Grinders formed of laminee, with numerous roots. Canines cylindrical, conical; the upper bent upwards. Eyes and nostrils ou a level with top of head. Young not streaked. Hab. Africa. Lives floating among reeds. Intermediate between Suidce and Hippopotamidce. |