OCR Text |
Show 1869.] DR. J. E. GRAY ON THE TORTOISES. 207 Emys decussata, Bell; Gray, Cat. Shield Rept. in B. M. t. 36. f. 2 (skull). Skull in British Museum. The internal nostrils subanterior, between the converging alveolar plates; lower jaw with a short groove. 20. TRACHEMYS. TRACHEMYS HOLBROOKII. Trachemys holbrookii, Gray, Ann. & Mag. N . H . xii. p. 181. Emys cumberlandensis, Holbrook. Fig. 16. Trachemys holbrookii. Skeleton (in separate bones) in the British Museum, prepared by Dr. Gunther. Skull ovate, solid, crown quite flat, sides of face shelving outwards ; nose rather produced beyond the mouth ; orbit very large, lateral, subsuperior, upper hinder edge narrow*; zygomatic arch very broad, convex; tympanic cavity subcircular. The edge of the jaws swollen, convex, labial edge rather arched, entire in front. The palate flat; internal nostrils large, subanterior, with an elongated broad slight concavity behind them. The alveolar |