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Show 724 DR. J. E. GRAY ON THE SKULLS AND [Nov. 4, 1. ELEPHANTOPUS. Forehead of skull flattened. Nose-hole broader than long, broadest and truncated above and narrowed below, and separated from the alveolar surface by a high thick intermaxillary bone. Nasal grooves of the palate moderately deep and much contracted behind, with a distinct central ridge for the whole of their length. ELEPHANTOPUS PLANICEPS. Testudo planiceps, Gray, Cat. Sh. Rept. t. xxxiv. (skull). 2. MEGALOCHELYS, Agassiz. Forehead of skull convex, swollen ; nose-hole much higher than broad, narrowed and rounded above, separated from the alveolar surface by a thin intermaxillary bone. Nasal grooves of the palate very deeply concave, expanded in the middle and slightly contracted behind. MEGALOCHELYS INDICA. Testudo indica, Gray, Cat. Sh. Rept. t. xv. f. 1 (skull). 3. ASTEROCHELYS, Gray. Forehead of skull flattened. Nose slightly bent down in front; nose-hole square, rather broader than wide, truncated behind, separated from the alveolar surface by a high intermaxillary bone. Nasal grooves of the palate deeply concave in front, rather dilated behind, with three ridges in the centre of the front. A S T E R O C H E L Y S RADIATA. (Plate L X . fig. 2, alveolar processes of jaws.) Testudo radiata, Hand-list, p. 4. Tribe III. CHELONOIDINA. The lower jaw with a ridge on each side of the linear alveolar concavity, the front ridge continued and ending in a sharp-edged prominence, with a very slight central longitudinal ridge extending from the front to the back edge of the jaw ; the hinder marginal ridge ending just as it reaches the front edge of the jaw, leaving a broad slightly keeled space in front of the inner edge of the jaw. The alveolar process of the upper jaw with two ridges, with a large broad concavity in front between their front ends, extending behind into a triangular flat disk between the inner nostrils, which have a deep groove behind each of them. 1. CHELONOIDES, Fitzinger, Ag. (No character.) Forehead flattish. Nose-bole broader than high, with a central prominence on the upper and lower edge, aud a moderately high intermaxillary bone. C H E L O N O I D E S T A B U L A T A . (Plate L X . fig. 3, alveolar processes of jaws.) Testudo tabulata, Gray, Cat. Sh. Rept. t. xxxv. f. 2, a, b, c (not good). |