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tinuoTis with the lower labials. A strong group of spines on the 

 post-temporal region. A short but strong, low, nuchal crest of 

 about six spines, and a rosette of spines a little way external 

 to its middle. Fifteen to seventeen upper and lower labials. 

 Scales of the body small, imbricate, keeled, witli sharp but 

 abort projecting points, the largest along the middle of the 

 back, arranged more or less in transverse series ; 119 scales 

 encircling the middle of the body, and 58 rows occurring 

 between the origin of the limbs. The scales on the limbs very 

 much larger and more strongly imbricate and keeled than those 

 of the body ; the scales on the base of the tail nearly four times 

 as liirge as the largest body-scales. The scales on tbe sides of 

 the body are smaller than the ventrals, which generally have 

 small sharp points, and are either feebly keeled or smooth. 

 The scales on the tail are strongly keeled and terminate in 

 short sharp points. On the base of the tail the scales are 

 not arranged in segments, but, a short distance further back, 

 the tail becomes segmented, each division containing about four 

 annuli. The skin of the neck forms a loose longitudinal fold, 

 (there is no true gular pouch), and is traversed transversely by 

 a fold between the angles of the jaw, ending posteriorly in 

 the true gular transverse fold. The upper surface and the 

 sides of tbe neck are in loose folds. A fold arises from the 

 rosette of spines external to the middle of the nuchal crest, 

 and passes outwards and backwards a short way and terminates 

 in a prominent spiny eminence, from which a fold crosses 

 tbe upper surface of the neck to the corresponding eminence 

 on tbe opposite side : in its course across, there are three 

 rosettes — one external to the mesial line, another to its fellow 

 of the other side of the neck, and the third on the mesial line 

 immediately behind the nuchal crest. Another small fuld arises 

 at the prominent spiny eminence, and passes backwards to the 

 front of the prsehumeral pit, and ends in a few small spines, at 

 which point it is joined by two small folds from the angle of 

 the jaw. Erom the point of union of these folds, another passes 

 upwards over the shoulder, along the side to near the sacral 

 region, and in its course it is more or less beset with small spiny 

 scales or rosettes. Immediately above the shoulder, a small 

 spiny fold crosses up to the side of the neck. From behind the 

 transverse nuchal fold, a series of small spines, set at intervals, 

 extend as far back as the shoulder. The limbs are well developed, 



