266 COLUBRID. 
II. Maxillary extending forwards beyond the palatine; ventral 
shields large. 
Nostrils on the upper surface of the snout ; nasal shields in contact 
with each other; maxillary a little longer than the ectopterygoid, 
with 8 to 10 grooved teeth in addition to the poison-fangs. 
212. Aipysurus, p. 303. 
Nostrils lateral; nasals separated by the internasals; maxillary 
much shorter than the ectopterygoid, with one or two small solid 
teeth in addition to the poison-fangs. 213. Platurus, p. 306. 
204. HYDRUS. 
Hydrus, part., Schneid. Hist. Amph. i. p. 233 (1799). 
Pelamis, part., Daud. Hist. Rept. vii. p. 357 (1803); Fischer, Abh. 
Naturw. Hamb, iii. 1856, p. 61. 
Pelamis, Fitzing. N. Class. Rept. p. 29 (1826); Wagl. Syst. Amph. 
p. 165 (1830) ; Gray, Cat. Sn. "4 41 (1849); Dum. & Bibr. Erp. 
Gén. vii. p. 1833 (1854) ; Giinth, Rept. Brit. Ind. p. 382 (1864). 
Fig. 19. 
La 
La 
¥ 
S 
is 
> 
Vn 
f*) 
B; 
x 
Vad 
x 
Sar ts bs 
. a Js eee 
7 ——— 
Skull of Hydrus platurus, 
-Hydrophis, Schleg. Phys. Serp. ii. p. 488 (1887); Jan, Elenco 
iat "Of. 100 (1868). oe ee 
Thalassophis, part., Schmidt, Abh. Naturw. Hamb. ii. 1852, p. 75. 
4 
Hydrus, Bouleng. Faun. Ind., Rept. p. 397 (1890). ; 
