AMPHIBIANS AND REPTILES. 233 
site suture between second and third vertebral plates, and pos- 
terior and anterior descent of profile more or less similarly and 
evenly convex. No median vertebral keel. Posterior surface of 
carapace sloping down more gradually than anterior and mar- 
ginal plates all more or less expanding out, those at bridge most 
steep. Edge of carapace as seen in profile forming but a slight 
angle at junction of ninth and tenth marginal plates, and from 
over bridge it slopes evenly up anteriorly. ‘Two median plates 
forming bridge deeper than long, and their uppermost edges 
forming a well-marked lateral ridge to carapace, which also 
extends a short distance further both in front and behind. In- 
guinal and axillary plates large and rather broad. Plates of 
carapace smooth, striz obsolete, and with a slightly corrugated 
appearance. Plastron elongately ovoid, without marked con- 
striction, and its greatest width falling about last fourth in its 
length or opposite middle of femoral plates. Front of plastron 
truncate, and then a slight emargination at junction of each 
thoracic with humeral plates in convergence towards bridge. A 
notch at junction of femoral and anal plates, also median junc- 
tion posteriorly of pair of latter. Plates on plastron with obso- 
lete angular striz. Head comparatively small, slender or 
fusiform, depressed both above and beiow, and with somewhat 
swollen appearance posteriorly. Upper suriace more or less level. 
Snout obtusely protruding beyond mandible, nearly as long as 
broad, short, and in profile sloping convexly down inferiorly 
towards mandible. Eye moderately large, socket a little over 
3 in head, much larger than snout, lateral and circular. Mouth 
inferior, edge of upper jaw closing- over lower, emarginate ante- 
riorly as viewed laterally, and when viewed in front also with a 
distinct notch. Edges of jaws flattened or levelled inferiorly, 
especially in front. Mandible when viewed from below rather 
broadly convex, so that its length is about 34 its width. When 
viewed above profile of head forms a rather even triangle. Head 
and neck at least distensible for space equal to third of carapace, 
and skin rather finely wrinkled on neck where it forms a fold 
over retracted head. Legs, feet and tail covered with well- 
developed scales, those on front of fore limbs, and region of hal- 
