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Show 726 DR. J. E. GRAY ON THE SKULLS AND [Nov. 4, 4. TESTUDINELLA. Toes 4.4. We have only one specimen of this animal, the skull of which is in the skin, and therefore the alveolar surface cannot be examined; but it is like Peltastes greeca in external appearance, being only known from it by wanting one front toe. TESTUDINELLA HORSFIELDI, Gray, Cat., Append, p. 13. 5. CHERSINA. Toes 5 . 4. Intergular plates united together and produced forwards. Alveolar process of the upper jaw simple, with a slight groove on the hinder part of the lateral margin. The internal nostrils in the front of a deep concavity that is very slightly contracted on the sides behind. Lower jaw sharp-edged and concave on the inner surface in front, and with a prominent inner edge on the hinder part of the side fitting into a groove in the upper jaw. Front of beak rounded, with a groove on the lower side of each nostril towards the margin, which is marked with three close teeth. CHERSINA ANGULATA, Gray, Cat., App. p. 14. (Plate LX. fig. 6, alveolar processes of jaws). Section III. Alveolar surface of upper jaw narrow in front, broad behind, triangular on the sides, with a sharp edge on each side of the lower jaw, linear, narrow, with a rather sharp edge on each side. Tribe V. HOMOPINA. 1. HOMOPUS. Toes 4.4. Alveolar surface of the upper jaw triangular on each side, with a sharp edge on the outer side and on the inner side of the hinder part. Lower jaw thin, weak, slender ; alveolar surface linear, rather broader in front, with a sharp slightly raised edge on each side. The internal palate broad in front to the front of the alveolar edge, rather wider in the middle, and slightly contracted behind. HOMOPUS AREOLATUS, Gray, Cat., App. p. 15. (Plate LX. fig. 5, alveolar processes of jaws.) Tribe VI. PYXIDINA. Alveolar surface of the upper and lower jaw linear, with a sharp outer edge. Lower jaw slender and weak. The front lobe of the sternum separated by a transverse suture and covered with the gular and postgular plate. 1. PYXIS. Skull short. Forehead flat. Orbits large. Nose-hole square, with a deep wide notch in the upper margin towards the frontal bone ; the lower edge transverse, with a central prominence. Intermaxillary rather high. Tympanic cavity narrow, erect, and the hinder part of the tympanic bulkc rather produced. |