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This species has quite the colouration of a Hydrophis, though 

 probably an estuary rather than an open sea species. It is how- 

 ever largely captured in company with great numbers of Hydro- 

 phis in the sluice nets (or creels) in the Bassein river below 

 Gnaputau. 



Cerberus, Cuvier. 



Body cylindrical. Tail rather compressed. Head high. Eye 

 small with vertical pupil. Snout only, shielded, the occiput 

 scaly. Nostril between two nasals, the anterior being largest 

 and forming a suture. Anterior frontals small triangular. Eye 

 surrounded by a ring of small orbitals.' Scales keeled in from 

 21 to 25 rows. 



C. rhynchops. 



Loreal as large as a postocular. One pr?eocular (sometimes 

 divided). Two postoculars. One infraocular. Upper labials 9 

 or 12. The fifth below the infraocular and the last five small. 

 Colour above blackish ash, slightly greenish, with irregular black 

 cross-bars. The two or three outer rows of scales yellowish. 

 Labials black spotted. 



Grows to four feet, though specimens more than 3 feet are rare. 

 Tail one-fifth of length. 



Inhabits the coasts of India and Barmah, and the Malayan 

 Peninsula, the Andaman and Nikobar Islands. 



HoMALOPSis, Gilnther. 



Habit stout. Head depressed, triangular, distinct from neck. 

 Eye small with vertical pupil. Nostril in a single nasal divided 

 by a groove from the nostril outwards. Anterior frontal small 

 (rarely divided). Eye surrounded by a ring of small orbitals. 

 Posterior upper labials transversely divided into two or three. 

 Scales striated and keeled in 37 to 47 rows. 



H. buccata, L. 



H. (Pythonia) semizonata, Blyth. 

 Anterior frontal broader than long, smaller than a postfrontal. 

 Loreal longer than high, sometimes divided. One or two 



