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Show 200 DR. J. E. GRAY ON THE TORTOISES. [Mar. 1 1, Tribe V. BATAGURINA. 16. TETRAONYX. TETRAONYX BASKA. (Fig. 11, p. 199.) Batagur baska, Gray, Cat. Shield Rept. p. 35. Skull B.M. 17. KACHUGA. * The upper jaw with a short very distinct central longitudinal dentated ridge behind the deep conical pit in the front of the jaw, which commences between the ends of the secondary ridyes. The lower jaw with a deep longitudinal groove in front behind the central conical prominence on the edge. t Palate flat, with two very deep oblong concavities, one behind each of the internal nostrils. The ridges of the upper jaw are elongate, and the anterior central ridge is broad at the base, with a deep broad concavity on each side between the sphenoid and condyle. The inner surface of the front part of the lower jaw is erect, without any expanded plate. BATAGURELLA. 1. KACHUGA PEGUENSIS. (Fig. 12, p. 201.) The concavities behind the internal nasals as broad behind as in front; orbit large, irregular, oblong, nearly as high as long in front. Hab. India. Presented by W . Theobald, Esq. The thorax is unknown. ft Palate narrow, concave, with a ridge on each side and two moderately deep concavities behind each internal nostril, each marked with a central lonyitudinal ridye. The ridges on the uq)per jaw short, and the anterior central ridge narrow and sharp-edged. The front part of the lower surface of the temporal bone, between the condyle and sphenoid, shelves upward, not forming a broad cavity. The inner surfaces of the front part of the lower jaw have a shelving qilate for the support of the inner longitudinal ridge on the upper dental surface. The orbit regular, oblong, moderate. The thorax is unknown. KACHUGA. 2. KACHUGA TRILINEATA, Theobald. (Fig. 13, p. 202.) The concavities behind the internal nostrils oblong elongate, narrow, narrower and deeper behind; orbits very large, regular oblong, much longer than high. Hab. India. Skull Brit. Mus. 3. KACHUGA OLDHAMI. (Fig. 14, p. 203.) Hah. India. Presented by Prof. Oldham. ** The upper jaw with a notch between the two divergent ridges, and an indistinct broad longitudinal ridge in the centre of the |