1869. ] DR. J. E. GRAY ON THE TORTOISES, 213 
than on the sides, flat, with a slight concavity on the outer and 
couvexity on the inner side béhind. Central anterior palatine 
groove in the beak narrow, linear, deep, in the skull narrow, 
elongate, but very slightly marked ; the front of the palate is 
very deeply concave to the front edge of the internal nostrils, 
and then bent up on the sides of them. Internal nostrils 
oblong. A. cariniferus, P. Z. 8. 1364, p. 83, f. 4-6. 
7. Rarerus. Head broad, forehead convex. Skull rather longer 
than broad at the ears. Anterior central palatine groove broad 
and shallow, rather broader behind than in front. Alveolar 
surface of the jaws narrow, linear, in the upper jaw scarcely 
wider in front than behind, in the lower jaw rather wider in 
front, smooth, slightly concave on the sides, with an oblong 
slight concavity on each side; the concavity behind the inter- 
nal nostrils deep, and rather narrower behind. Internal nostrils 
large, circular. R. euphraticus, P. Z. S. 1864, p. 81. 
** The front of the lower jaw with a shelving inner surface and a 
narrow sharp alveolar edge, and with a more or less dilated 
concave alveolar surface on the sides, rather narrow behind. 
a. Face short, rounded ; forehead convex ; anterior central longitu- 
dinal palatine groove narrow, deep, short. Sternal callosities 
four. 
8. PoramocueEtys. The alveolar surface of the upper jaw convex, 
shelving outwards, elongate, only slightly wider behind; of 
lower jaw rather wide, concave, and shelving inwards in front, 
rather dilated on the hinder half of the sides, with a slightly 
shelving oblong concave surface. The upper jaw bent down in 
front. The palate flat behind ; the central anterior palatine 
groove narrow, deep, short; internal nostrils oblong, anterior, in 
a deep cavity, partly hooded by the alveolar surfaces of the 
upper jaw, and with an elongate deep concavity behind each. 
P. stellatus, P. Z. S. 1864, p. 85, f. 7, 8. 
B. Face tapering on sides, narrow in front ; forehead shelving. An- 
terior central palatine groove broad and shallow; internal nos- 
trils oblong, large. 
9. Docanta. Head broad; face very short, narrow infront. Skull 
depressed, broad ; underside of skull straight, not bent down 
in front. Anterior central palatine groove shallow, broad, 
rounded in front, very slightly narrowed behind. Alveolar sur- 
face of the upper jaw flat, broader behind, of lower jaw mode- 
rately broad, with a shelving upper surface, and a sharp, simple 
alveolar edge, rather expanded and flattened out behind and 
slightly concave on the surface. Internal nostrils oblong, large, 
Proc. Zoo. Soc.—1869, No. XV. 
