216 PROFESSOR F. M. BALFOUR. 



Ill some it is dark, as in the specimen figured (fig. 1) ; in 

 others it is of a lighter shade. 



There is present in most specimens a fairly broad light band 

 on each side of the body, immediately dorsal to the attachment 

 of the legs. This band is more prominent in the lighter 

 coloured varieties than in the dark, and is especially conspicuous 

 in large individuals. It is due to a diminution in the green 

 pigment, and an increase in the brown. 



There is a dark line running down the middle of the dorsal 

 surface, in the middle of which is a fine whitish line. 



The ventral surface is almost entirely free from the green 

 pigment, but possesses a certain amount of light brown. This 

 brown pigment is more conspicuous and of a darker shade on 

 the spinous pads of the foot. 



In parts of the body where the pigment is scarce, it is seen 

 to be confined to the papillae. This is especially evident round 

 the mouth, where the sparse green pigment is entirely confined 

 to the papillae. 



In some specimens a number of white papillae, or perhaps 

 light brown, are scattered over the dorsal surface ; and some- 

 times there is a scattering of green papillas all over the ventral 

 surface. These two peculiarities are more especially noticeable 

 in small specimens. 



Ridges and Papillse of the Skin. — The skin is thrown into a 

 number of transverse ridges, along which the primary wart-like 

 papillae are placed. 



The papillae, which are found everywhere, are specially de- 

 veloped on the dorsal surface, less so on the ventral. The 

 papillae round the lips differ from the remaining papillae of the 

 ventral surface in containing a green pigment. Each papilla 

 bears at its extremity a well-marked spine. 



The ridges of the skin are not continued across the dorsal 

 middle line, being interrupted by the whitish line already 

 mentioned. Those which lie in the same transverse line as 

 the legs are not continued on to the latter, but stop at the 

 junction of the latter with the body. All the others pass round 

 to the ventral surface and are continued across the middle line; 



