AMPHIBIANS AND REPTILES. Ga 
keel marks upper boundry of costal grooves on each side and 
outline of back. Grooves on tail conspicuous, first extending 
across lower surface, only becoming obsolete towards tip, and 
about 30 distinct. Longitudinal keel along side of back, only 
distinct on tail above anteriorly. ‘Tail long, compressed with 
constriction below so that it is oval in cross-section most of its 
length, and swelling a little from base where slightly constricted 
all around. Upper edge of tail with a low keel only on its ter- 
minal 24, while below its entire edge furnished with a median 
keel just after vent. ‘Tail with a rather slender tip, as seen in 
profile. A median groove extends down back from occiput till 
opposite origins of hind limbs, and at former point it bifurcates, 
sending a branch to each eye. Head rather small, broad as 
wide, if not a trifle wider than greatest width of body, very 
obtuse, and depressed both above and below. Profile blunt and 
obtuse, angle forming nearly midway in its depth. Snout with 
length a trifle more than twice in its width, projecting well 
beyond closed mandible, and broadly convex when viewed from 
above. Eye elongate, ellipsoid, small, and placed near first third 
in length of head. Eyelids fleshy and moderately developed. 
Pupil circular. Mouth broad, and when viewed from below seen 
to be more evenly convex than blunt profile of snout or upper 
jaw. On each side of upper jaw, when seen from below, fleshy 
edge bulging out. Lips firm, little developed. VPostrictal trans- 
verse or vertical groove obsolete, developed as a slight bifurca- 
tion at branch from lower postocular groove. Following, 
another similar transverse groove crossing over lower postocular 
groove and uniting at junction of upper ocular grooves at occiput. 
A short space behind this still another, also crossing lower post- 
ocular groove to median dorsal groove. ‘Then gular groove, 
which is continued all around on sides and lower surface, and 
there overlapping. Neck decidedly constricted behind so that 
parotid region is much swollen, at least equal to width of skull. 
Teeth in jaws in a single even series, small, and not especially 
numerous. Palatine teeth minute, arranged in 2 small patches 
convergent backwards, though separated. ‘Tongue moderately 
large, somewhat heart-shaped or with slight emargination pos- 
teriorly at end of plicated surface. Each of internal nares a little 
