1869.] DR. J. E. GRAY ON THE TORTOISES. 193 
flat, with three rather thick ridges, the central one long, the side 
ones short. The lower jaw very strong, thick, bent up in the centre 
in front and acute; the alveolar surface very broad, slightly concave 
the whole length of the sides. Length 1 inch 73 lines, width 1 inch 
5 lines. 
13. Damonta. 
Head very large, covered with a hard thin skin. Nose high, 
truncated ; nostrils in a small disk notched out on the upper edge 
of the very high convex upper beak. Eyes lateral, subsuperior. 
Sides of the face shelving outwards below. Zygomatic arch strong, 
wide. The labial edges of the upper beak slightly arched, bent 
inwards. Lower jaw very strong, convex and rounded in front below, 
with a strong, sharp-edged, broad central tip. The alveolar disk of 
the upper and lower jaws very broad, the upper flat, and the lower 
Fig. 8. 
Damonia macrocephala. 
concave. The internal nostrils subcentral, with a short oblong 
sunken space behind each. The thorax oblong, more or less dis- 
tinetly three-keeled ; the vertebral shields six-sided, as broad behind 
as before; marginal plates dilated over the hinder limbs. Sternal 
