HYDROPHIDA. 73 
clivous, rather pointed. Body covered with 19-21 rows of large, highly 
carinated, imbricated scales, higher than long, with apex slightly trun- 
cated; frontal shields small, not much larger than the preocular; one 
postocular; five upper labials, the third and fourth of which enter the 
orbit, the last one below the postocular ; two or three large temporals on 
the side of each occipital, the anterior of which enters the labial margin 
behind the fifth labial; anal scuta small; terminal scale of the tail large; 
a series of seven simple teeth behind the fang in front; trunk variegated 
with 34 to 86 black cross-bands, broadest on the back, and extending to 
the belly in young individuals. 
The genus Hydrophis is sufficiently described for the pur- 
pose by what has already been given. The description of 
each species can only be carried out in detail in a zoological 
treatise. 
Sixth Species—ENHYDRINA, Gray. 
This genus differs from the Hydrophis only in the deep 
cleft in the lower jaw where the mandibles do not unite, and 
the fold of the integument connecting them forms a deep notch. 
Dr. Russell describes two species as Valakadyen and Hooghly 
Pattee : 
Enhydrina Bengalensis, Gray. 
ee valakadyen, “ 
Valakadyen, Lussell. 
Hydrus valakadyen, Boie. 
Hydrophis schistosa, Schleg., Fisher, Dum. and Bib. 
Hydrus schistosa, Cantor. 
Hydroph. Bengalensis, Gray. 
. “  subfasciata,  “ 
Thalassophis Werrerii, Schmidt. 
Dr. Russell says these have no fangs, but the specimens 
examined show a short fang with the poison-channel open 
throughout a part of its length. (For description, see Russell, 
vol. ii, 10 and 11.) 
