ON YCHOCEPH ALUS VERTICALIS. — Smith, 
Reptilia. — Plate LIV. Fig. A. 
o. Viridi flavus; scuto rostrali postice, dilitato, margine posteriori curvato ; scuto preoculan angusto ; 
labio superiori scutis quatuor ; cauda brevi, apice aculeata. 
Longitudo e nasi apice ad basin caudse 6 unc. 7 J lin. ; caudse 2 J lin. 
Colour.— The body and tail wine-yellow, tinted with pale, buff-orange ; 
head pale sienna-yellow. 
Form, &c. — Figure moderately slender ; body and tail cylindrical ; head 
slightly depressed ; nose rounded ; the first third of the body not quite so 
thick as the last two-thirds ; the thickness of the latter rather less than that 
of a common sized goose quill ; tail slightly curved, suddenly tapered to a 
point, which consists of a short conical spine. The rostral plate is broadest 
towards its hinder extremity, and its edge behind is arched ; naso-rostral 
plate broad below, narrower above, where, in this species, a portion of each is 
in contact with its fellow of the opposite side, and so separates the anterior 
frontal from the rostral plate ; preocular plate narrow ; ocular plate irregular, 
rather large, and several sided, its under edge resting partly on the third 
labial scale, but principally on the fourth ; anterior frontal plate the same 
shape as the frontal and the scales of body, but considerably larger ; the 
supra-ocular and parietal plates narrow, irregular, and in one direction, the 
transverse, of considerable length, the prolonged acute point of the ocular 
plate is inserted between them. The eye is situated in the angle formed by the 
union of the hinder edge of the supra-ocular and pre-ocular plates. The plates 
of the upper lip, four, the two anteriormost separated from each other by the 
intervention of a narrow, square portion of the rostral plate ; these and the 
one next to them on each side are small ; the third is rather larger, and the 
fourth much the largest. Scales of the body rather small, and six-sided, 
