A MONOGRAPH OF: THE SEA-SNAKES (HYDROPHTIN A2). 207 
Known from a single very young specimen in the Indian Museum, described 
by me. 
It presents very definite characters which demarcate it very clearly from other 
species. These are notably the scales in the neck and body which are 48 and 54 
respectively. These numbers only accord with c@rulescens and ocellata. ‘The num- 
ber of the ventrals (over 420) and imbricate character of the scales posteriorly are 
sufficient to exclude both c@rulescens and ocellata. In general appearance it is ex- 
tremely like fascrata. 
Description.—The portion visible above is about half the suture between the 
nasals. Prefrontals,—totch the second labial. Postoculars,—one. Tem- 
porals,—one anterior on the right side, two on the left. Supralabials,—seven, 
none divided. Infralabials,—four, the fourth largest and in contact with three 
scales behind ; the suture between the first pair subequal to that between the anterior 
sublinguals Marginals,—one after the third infralabial. Sublinguals,—two 
well developed pairs, the fellows of each in contact. Costals,—anterior 48?! 
midbody 54?! posterior 45; 1mbricate everywhere. Ventrals,—exceed 420 (prob- 
ably are 15 to 30 more, but the neck is tent), entire and about twice the breadth 
of the last costal row everywhere. Colour,—head and neck black; body with 59 
well defined annuli not confluent ventrally except in front, about as broad as the 
interspaces at midcosta. 
Habitat—Rangoon. 
DISTIRA MAMILLARIS (Boulenger, nec Daudin). 
Hydrophis fasciata, Giinther, Rept. Brit. Ind., 1864, p. 374, pl. xxv, fig. Q and Q’. 
mamillaris Boulgr. in Blanford, Fauna Brit. Ind. Rept. and Batrach., 
1890, p. 401, and Cat., 1806, iii, p. 277. 
”) 
Fig. 18.—Distiva mamuillaris, x 2. 
The name mamillaris originated with Daudin. who applied it to the original of 
plate xliv of Russell’s first volume. ‘This plate, I consider, represents without doubt 
the gracilis of Shaw as already mentioned under that species, so that the form now 
under discussion has no right to this des‘gnation. 
The type-specimen of the form referred to by Mr. Boulenger as mamullaris is, I 
| The specimen is sodden, and the scales difficult to count with certainty. 
