242 s A u R i A. 



extends, obliquely inclined forwards, from the second upper labial to 

 the lateral angle of the prefrontal, being contiguous behind to the 

 ppstfrontal and the loral. The latter is contiguous above to the post- 

 frontal and anterior supraciliary, below to the second upper labial, 

 and posteriorly to a quadrangular anteorbital, a direct continuation of 

 the infraorbital chain, and placed immediately beneath the anterior 

 supraciliary. The transparent disk of the lower eyelid is elliptical 

 and well developed. The upper labials are seven on either side ; the 

 fifth entering into the orbital chain, beneath the transparent space of 

 the eyelid; the first is long and narrow, with the nasal resting entirely 

 upon it ; the four following are subquadrangular, increasing somewhat 

 in size backwards; the sixth and seventh are subrhomboid. The sym- 

 physeal plate, broader than the rostral, is hemidiscoid or semilunate. 

 The lower labials are very narrow and long, five on either side. The 

 mental shields are broadly developed, three pairs and an odd one ; 

 the shields of the anterior pair contiguous; the others diverging. 



The scales are striated under the epidermis, which is smooth ; they 

 are larger upon the abdomen than on the back, smallest upon the 

 sides, and disposed upon twenty-eight longitudinal series, across the 

 middle of the body; the two middle dorsal series are larger than the 

 adjoining series, and a shallow groove may be seen between them. 

 The caudal scales are conspicuously larger than the dorsal and abdo- 

 minal ones. 



The upper regions are brown, unicolor along the dorsal region, with 

 an obsolete chestnut band composed of a series of small curves, convex 

 backwards, situated along the upper portion of the flanks, from the 

 upper edge of the orbit to a certain distance along the tail, and beneath 

 it, transverse irregular fasciae or spots of the same chestnut hue. The 

 inferior regions are of a very light brown, unicolor. 



LOG. Bay of Islands, New Zealand. 



Plate XXVII, fig. 17, represents Hombronia undosa, size of life. 



Fig. 18, the head, viewed from above ; 



Fig. 19, a profile view ; and, fig. 20, an under view of the same. 



Fig, 21. the left hand, from above; fig. 22, the same, from below. 



Fig. 23, a group of dorsal scales. 



Fig. 24, a group of abdominal scales. 



Figs. 18-24, are somewhat magnified. 



