1873.] ALVEOLAR SURFACES OF TORTOISES. 725 



2. SCAPIA. 



Skull (see Cat. Sh. Rept. Suppl. p. 7, f. 1) apparently very 

 like Chelonoides. The front of the upper and lower jaw is rounded, 

 and the edge simple, not toothed. Space between lateral ridges 

 wider ; and the lower edge of the front part of the lower jaw is 

 expanded. The intermaxillary bone is high. 



Scapia gigantea, Gray, I. c. p. 18. 



Testudo (Scapia) falconeri, Gray, P.Z.S. 1869, p. 170, fig. 1 ; Cat. 

 Suppl. p. 7, f. 1 (skull, which is no longer in the British Museum). 



3. Manouria. 



We have no separate skull of this genus in the British Museum. 

 In external appearance it is very like the skull of Scapia. 



Manouria emys, Gray, /. c. p. 18. 



Section II. The alveolar surface of the upper jaw narrow and fiat 

 in front, with a short ridge on each side and a slightly raised 

 inner edge. The lower jaw sharp in front, with two sharp 

 edges on the side, separated by a longitudinal groove fitting 

 the ridge in the upper jaw. The lower jaw weak, slender. 



Tribe IV. Peltastina. 

 1 . Peltastes, Gray, Cat., Appendix, p. 5. 

 Toes 5.4. Upper beak with three teeth on the front margin. 

 Upper jaw with a wide concave space in front, edged behind, with 

 a slightly raised ridge from one lateral alveolus to the other, and 

 with a broad and deep concavity behind it. Inner nostrils widened 

 out in the middle and then again contracted. Lower jaw with a 

 slightly raised longitudinal ridge across the alveolus in front. 



Peltastes elongatus. 



Peltastes elongatus, Gray, Cat. Suppl. p. 10, f. 2 (skull). 



2. Centrochelys. 

 Toes 5 .4. Beak three-toothed, rounded in front. Upper hinder 

 part of thighs with large conical spine-like scales. Nuchal shield 

 none ; grooves in the palate behind the inner nostrils, scarcely wider 

 in the middle. The grooves separated by a central ridge, and deep, 

 to the hinder part of the palate. 



Centrochelys sulcatus. 



Peltastes sulcatus, Gray, Cat. 



3. Chersinella, Gray, Cat., Append, p. 5.' 



Toes 5 .4. Beak toothless, rounded in front. Thighs unarmed. 

 Nuchal shield none. 



Chersinella gr^eca. (Plate LX. fig. 4, alveolar processes of 

 jaws.) 



