CORDYLUS GIGANTEUS. 
upper sub-keeled, and unlike the ones before them, which are quadrangular 
and flat. Hind head and temples posteriorly margined with a row of long 
striated somewhat triangular and pointed spines which extends from the base 
of the lower jaw of one side to the same part on the other ; the four 
edging the hinder part of the head superiorly directed backwards and 
very slightly outwards, the five edging each temple outwards and very 
slightly backwards, and are considerably shorter than the former. The 
scales, four, covering the lower jaw very large, the three first quad- 
rangular, the last somewhat pointed behind. Scales of temples large, 
imbricate, striated, triangular, and with the apex pointing backwards. The 
scales on the neck and body superiorly, and on the sides arranged in regular 
transverse rows, the base of each scale being flat, more or less quadrangular, 
and with a keel proceeding along its middle ; the scales of the sides of 
the back, body, and neck terminate, is a strong triangular divergent spine ; 
those on tbe sides of the neck longest, rather irregularly placed, and 
extend nearly directly outwards : as compared with the sides, the back is 
comparatively smooth, the scales being only rugose and faintly carinated. 
The scales of the upper and lateral parts of the tail in whorls, very rugged 
and hard, and each has a prolonged triangular spine directed outwards and 
backwards ; the scales of the under surface long, narrow, five-sided, smooth, 
and pointed behind. The scales of the extremities superiorly and anteriorly 
flat at base, and each is surmounted by a divergent spine more or less 
developed ; the spines of the fore legs towards the body prominent 
towards the toes, only faint ; on the hinder legs the spines generally are 
strongly marked. The under and hinder surfaces of fore legs towards body- 
are covered with small irregular, somewhat granular scales which anteriorly 
are edged near the body by a row of three very large tubercular scales 
very different from the others described : and besides these there is, 
towards the foot, on the opposite side of the under surface of the legs, a 
cluster of conical tubercles generally arranged in three or four longitudinal 
rows, and having their points inclined towards the toes. The feet and toes 
covered with triangular flat scales, those below' slightly rugose. The under 
surface of hinder legs towards body is covered anteriorly with flat triangular 
scales, posteriorly towards femoral pores with slightly tubercular ones. The 
space between rami of lower jaw coated with small irregular roundish scales, 
the middle ones smallest, and anterior to them are four large plates in two rows, 
the two of the front row the largest. Scales of lower surface of neck trian- 
