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Show 1873.] DR. J. E. GRAY ON THE TRIONYCHlDcE. 49 the front odd bone of the dorsal disk is quite separate, with oblong pitted callosity ; the front margin of the dorsal disk has a central prominence nearly reaching the back edge of the odd bone. In young specimens the odd bone in the front of the dorsal disk is transversely elongate, rugose the whole of its width, separate from but very close to a central prominence in front of the dorsal disk. 2. TRIONYX LEITHII. The Poonah Mud-tortoise. (Fig. 3, p. 48.) A small species, the shell about 10 inches long and 6^ broad ; the alveolar surface of the lower jaw nearly flat, with a very slight longitudinal ridge across the front end. Trionyx leithii, Gray, Ann. & Mag. N. H. 1872, x. p. 334. Hab. Poonah, Dr. Leith. The history of this species is given in the Ann. & Mag. N. H. 1872, x. p. 334. There are two other specimens in the British Museum, from Mr. Day. The older one has the dorsal disk suborbicular, concavely truncated behind. The odd bone in front about half the width of the widest part of the dorsal disk, and united to it. The younger one has the dorsal disk with numerous, close, rather irregular, minute tubercles; the hinder edge is regularly arched; the front edge truncate, with a deep arched notch on each side of the central prominence; the odd marginal bone is rather broad, arched in front, and slightly concave on the sides of the inner edge, about | as wide as the breadth of the broadest part of the disk. ** The hinder part of the crown and sides of the head marked with pale spots. 3. T R I O N Y X H U R U M . The " Kaavez." Crown of the head varied with irregular black lines ; a yellow spot on each side of the crown and at the back angle of the mouth. Kaavez, Hardwicke, icon. ined. B. M. Trionyx hurum,, Gray, Synopsis Rept. tab. 10, copy of Hardwicke ; Gray, 111. Ind. Zool. tab., copy of Hamilton's ; Gray, Ann. & Mag. N. Hist. 1872, x. p. 335. Testudo hurum, Hamilton, icon. ined. The history of this large species is to be found in the Ann. & Mag. N. Hist. 1872, x. p. 336. 4. TRIONYX JEUDII. Skull, with nose rather elongate, produced forward, with a rather tapering outline ; orbit further from the cavity of the nostrils than the diameter of the orbit; alveolar surface of the lower jaw with a very distinct central longitudinal ridge in front, with a deep pit on each side. Trionyx jeudii, Gray, P. Z. S. 1869, p. 217, fig. 19 ; Suppl. Cat. Sh. Rept. p. 97, fig. 32 (skull). Hab. India. PROC. ZOOL. Soc-1873, No. IV. 4 |