A RARE SEA SNAKE FROM SIAM. 177 



sublinguals; posterior pair of sublinguals half the size of the anterior 

 and separated by 2 scales. Symphisial small. 28 to 30 scales round 

 the neck, 33 (in one 35) round the greatest diameter of the body, 

 hexagonal, juxtaposed, with a strong tubercle or sliort keel. Ventrals 

 small, equal to or a little broader than the adjacent scales, and 

 distinguished by the presence of a double tubercle or short keel. 



Colour (in life). Above, pale grey, with 32 to 36 (3 to 4 on tiie 

 tail) dark cross bars, which are much broader than their interspaces, and 

 taper to a point upon the sides. Below white. There are no annuli as 

 in the specimens described from the Archipelago. 



The one j'oung specimen obtained differs in no way from the 

 adults, except that the markings are more pronounced. 



The scales upon the head, particularly those around tiie snout 

 and lips, iiave unusually thickened edges, so that each one seems to stand 

 out separately. Spirit specimens, in which the tissues have shrunk, 

 show this peculiarity only in a small degree, ilinute tubercles may, 

 or may not be present on the head scales. 



Length of the largest, a c?, 810 mm,, tail 90. 



I am indebted to Mr. C. L. Groundwater, for his excellent and 

 very faithful drawings of the iiead. 



VOL. II, DEC. I'JIG. 



