54 REPTILES. 



six-sided, with a very slight central tubercle ; of neck larger, smoother : 

 one anterior and two posterior oculars : body much compressed, high : 

 ventral shield small, six-sided, from the throat, smooth. 



a. In spirits. Australian seas ? Presented by the Earl of Derby. 

 From Mr. Macgillivray's collection. 



10. The Shiddil. Hydrophis spiralis. Shiddil, Russell, Ind. 

 Serp. i. t. 12. Hydrus Shiddil, Boie, Isis, 1827, 554. Aturia spi- 

 ralis, Grm/, Zool. Misc. 61. Hydrus spiralis, Shaw, Zool. iii. t. 

 125. Euhydvis s\)iYa.\is, Merrejn, Tent. 140. Gray, Ann. Phil. x. 

 207,1825. Leioselasma spiralis, jP27z. Cat. Hydrophis nigrocincta, 

 part, Schlegel, Phys. Serp. 505 ? Hydrophis melanura, Wagler, 

 Amph. t. 3. 



Olive-green, beneath yellow, with a series of round black spots, 

 smallest on the middle of the body, back with rather narrow close 

 black rings, forming a line along the belly : tail black, with three 

 unequal red. rings at the base: the fourth upper labial shield under 

 the eye: in spirits pale yellowish ringed with brown, beneath 

 whitish : head moderate, black, with a horse-shoe-shaped yellow 

 band : first upper labial shields small, square ; second to sixth large, 

 high; last triangular, with a large scale above it: temple shield 

 short, broad : one anterior and two posterior oculars : three front 

 lower labial shields and fifth triangular, very small, with band-like 

 shields behind them ; sixth band-like ; seventh smaller : chin shields 

 two pairs, equal: body subcylindrical, slender. 



a. In spirits ; has been dried. Indian Ocean ? Presented by Dr. 

 Russell. Described and figured by Dr. Shaw. 

 Hydrus spiralis, Shaw, I. c. t, 125. 



h. In spirits. Indian Ocean. Presented by Sir James Mc'Grigor. 



c. In spirits. Indian seas. The two lower labial shields on one or 

 both sides triangular, with a band-like shield below them. Pre- 

 sented by Sir James Mc'Grigor. 



11. The Ringed Sea Snake. Hydrophis subannulata. 

 Black ; sides of body and tail with ovate or lanceolate white 



spots, which generally unite ; olive over the centre of the back, 

 forming rings, which are incomplete beneath ; crown and lips yellow- 

 spotted ; two spots in front of nose plates, a band across forehead in 

 front of eyes, and some spots on crown and at back angle of the 

 eyes ; neck with a narrow white ring ; hinder part of chin and angle 

 of the gape white varied : scales lanceolate, very obscure, keeled ; 

 keel narrow, extending rather more than half the length of the dor- 

 sal scales (most seen in the black scales) : one small anterior and 



