237 
are pierced. The upper jaw projects but very slightly beyond 
the lower. The eyes are very small, lateral, bordering on the 
profile; the diameter of the iris varies from WV to Vo of the 
length of the head. They are prominent, with their horizon- 
tal diameter converging towards the muzzle. They are situa- 
ted above the anterior third of the lip. The distance from the 
muzzle and from each other across the vertex, is contained 10 to 11 
times in the length of the head. The posterior nasal apertures 
open vertically between the eyes; their distance from each other 
nearly equals their distance from the eyes. They open in a 
small rounded or oval fossa. A tangent of the posterior mar- 
gin of this fossa, continued downwards, touches the posterior 
margin of the orbit. But a tangent of the anterior margin of 
the foss, if prolonged vertically, divides the eye. The anterior 
nasal apertures are very minute. They open laterally , on each 
side of the margin of the muzzle, through a small conical emi- 
nence, immediately behind which, on the vertical surface, there 
appears a small shallow depression or fossa. The distance 
between the anterior nasal apertures nearly equals that between 
the eyes. The anterior half of both lips is tumid and turned 
back over the jaw; the posterior half is membranous, narrow 
and tapering. The front-view of the muzzle is not unlike that 
of Acrochordus javanicus Hornstedt. The length of the gape 
is nearly 5, of the length of the head. The latter is general- 
Iy Vo of the total length. In some individuals, however, 
it slightly exceeds 9, in others it is nearly Îf times in the 
total length, The vertical diameter at the occiput is about 
of the length of the head. Between the eyes it scarcely exceeds 
1/, of thelatter dimension. The teeth are generally minute, but 
not equally so, those of the symphyses of the jaws and of the 
vomer and palate being a little larger than the rest. All are 
recurvous, econical, frequently truncated or with worn cusps. 
On each side of the symphysis of the upper jaw appears a 
small triangular cluster of teeth, disposed in double or triple 
series. The bases of the clusters are separated by a naked 
longitudinali interval. From the apex of the triangular cluster 
