ALYTfiS. 173 



halfway between the end of the snout and the eyes. 

 Eyes on the upper surface of the body, the distance 

 between them about twice as great as that between 

 the nostrils, and equal to or slightly greater than the 

 width of the mouth. Spiraculum in the mid-ventral 

 line, a little nearer the anterior than the posterior 

 extremity of the body. Anal opening median, very 

 much larger than the spiraculum. Tail twice and 

 two-thirds to thrice as long as deep, ending in an 

 obtuse point ; the upper crest convex, usually a little 

 deeper than the lower, and extending but very slightly 

 upon the back; the depth of the muscular portion, at 

 its base, about half the total depth. 



Beak white, with a broad black margin. Lip 

 entirely surrounded by a series of papillae. Labial 

 teeth in § series, occupying nearly the whole width of 

 the inner surface of the lip, all continuous, or the third 

 lower narrowly broken up in the middle ; the first 

 upper and the first lower series composed of one or 

 two rows of teeth, the others of two or three. 



Lines of crypts usually very indistinct; all that can 

 be distinguished being the usual lines from the end of 

 the snout between the nostrils, bordering the eyes 

 above, behind and below, and forming a loop on each 

 side of the upper lip, a line beginning at a considerable 

 distance behind the eye along each side of the back to 

 the upper border of the muscular part of the tail, and 

 another very short line close to and parallel with the 

 anterior extremity of the latter. But in a fine 

 specimen from Bellaigues, Switzerland, I find the 

 lines much more distinct and blackish ; in addition to 

 the series described above, it shows the second dorsal 

 line prolonged to the base of the tail, which also 

 bears two lines, the upper being on the supra-caudal 

 crest ; a short series descends vertically from below 

 the centre of the eye, another, curved, from below the 

 anterior extremity of the dorsal lines, a third on each 

 side of the mouth, and a fourth extends on each side 

 of the belly, from the level of the spiraculum nearly 



