208. HTDKOPHIS. 



273 



Frontal as long as its distance from 



the rostral ; ventrals 310-438 .... 21. obseurus, p. 284. 



5. 31 scales round the neck, 58 round the hody ; ventrals 483. 



22. leptodira, p. 285. 



Table showing Nxtmbees os Scales and Shields. 



1. HydropMs spiralis. 



Hydrus spiralis, Shaw, Zool. iii. p. 564, pi. cxxv. (1802). 



Enhydris spiralis, Merr. Tent.v- 140 (1820). 



Hydrophis melanurus, Wagl. Icon. Amph. gl. iii. (1828). 



nigrocincta, part., Schkg. Phys. Serp. li. p. 505 (1837). 



spiralis, Gray, Cat. p. 54 (1859) ; Giinth. Rept. Brit. Ind. 



p. 366, pi. XXV. fig. D (1864); Anders. Proc. Zool. Soo. 1872, 

 p. 397 ; Murray, Zool. Sind, p. 390 (1884) ; Bovleng. Faun. Ind., 

 Rept. p. 401 (1890) ; Boettg. Ber. Offenb. Ver. Nat. 1892, p. 88. 



nigrocinctus, Jan, Icon. 06n. 41, pi. ii. fig. 2 (1872). 



Head moderately smaU; hody moderately elongate. Eostral 

 hroader than deep; frontal longer than hroad, as long as its distance 

 from the rostral, a little shorter than the parielals ; one prse- and 

 one postocular ; a single anterior temporal, descending to the lahial 

 herder ; six or seven upper lahials, second largest, third and fourth 

 entering the eye ; two pairs of suhequal chin-shields, in contact. 

 28 or 29 scales round the neck, 33 to 35 round the body ; scales 

 imbricate, smooth in the young, with a central tubercle in the adult. 

 Yentrals distinct, but feebly enlarged, 270-334. Olive above, 



VOL. III. I 



