H E T E R N T A P E L A G I C A. gQJ 



than deep : the five anterior are well developed ; all diminishing in 

 size posteriorly. The symphyseal is much larger than the rostral, 

 subpentagonal or subtriangular, and produced under the chin, beyond 

 the labials ; its posterior extremity is not surrounded by any plate. 

 Two very small mental shields may be observed, one on each side, 

 and not contiguous to the labials, from which they are separated by 

 the minute and uniform granules observed all over the inferior surface 

 of the head. The lower labials are eight on either side : the first pair 

 being a little smaller than the second and third ; the four anterior 

 pairs considerably larger than the rest, are longer than deep. The eyes 

 are subelliptical and well developed, whilst the auricular aperture is 

 small and subcircular. The upper surface of the head is granular, 

 finely so upon its posterior portion, including the temples, and over 

 which the tubercles extend, and more coarsely anteriorly, where the 

 granules become scale-like, exhibiting at the same time, traces of 

 carination. Similar, carinated, scale-like granules may be observed 

 upon the cheeks, between the eye and the ear, and under the jaws and 

 neck also. The sides of the upper surfiice of the neck are granular and 

 tubercular. The granules over the back and sides are pretty uniform, 

 mayhap, not quite so crowded upon the sides, and somewhat smaller. 

 The tubercles themselves are nearly equal, except towards the head 

 and neck, where they are somewhat smaller; they constitute eighteen 

 longitudinal series, nine on either side, across the middle region of 

 the body; they diminish in number as they approximate the tail, 

 beyond the base of which they do not extend. In shape, they are 

 subcorneal or subtriangular, their surface being distinctly striated. 

 The granules themselves appear striated. The chest and belly are 

 covered with uniform ovate scales, with a few larger ones upon the 

 interfe moral region, all distinctly keeled. 



The limbs are slender ; their surface is covered with small, scale- 

 like, and keeled granules, with scattered tubercles over the posterior 

 pair. The axillae, groins, palms, and soles are finely granular. The 

 posterior aspect of the thighs exhibits these tubercles in the midst of 

 minute granules. The upper surface of the fingers and toes is 

 minutely granular; their under surface being provided with transverse 

 thickish plates. 



' The tail is protected by subhexagonal and conspicuously keeled 

 scales, larger than on the abdomen, and arranged upon circular series, 

 else subverticillated. 



