34 OPHIDIANS. 
33//; head oblong-oval, compressed on the sides, a little broader than the 
neck, obtuse, flat on the crown; ten lamine, with a singular triangular- 
shaped lamina between the nostrils ; mouth of middle size, three rows of 
teeth in upper jaw; no fangs; eyes large; nostrils small, close; trunk 
round; tail tapers rapidly, and terminates in « sharp point; scales 
smooth, ovate, small; color, crown and upper part of body a bluish 
clay ; body variegated with dusky spots; belly a tawny buff. 
No. 6. The Col. natr. trop. picturatus is a sub-variety, 
found in Australia. 
No. 7. Col. natr. trop. natrix, is the Grass or Ring Snake, 
common in England. 
EIGHTH GENUS—HOMALOPSID 2. 
Fresh-water snakes ; composed of 13 species, made up of 
19 varieties. . 
The distinguishing mark for this genus is that the openings 
of the nostrils are on the top of the snout. Grinther gives 
8 species, as follows, viz. : 
No. 1. Homalopsis (Tatta Pam). 1 sub-variety. 
2. H. fordonia. 1 es 
3. H. cantoria. 1 ne 
4, H. cerberus (Karoo Bokadam). 1 
5. H. hypsirhina (H. hyps. aer.). 5 sub-varieties. 
6. H. ferania. 1 sub-variety. 
7. H. hipistes, A a 
8. H. herpeton (H. tentaculus). 1 x 
Russell describes an East India variety, called Tatta Pam 
in Vizagapatam, and Ang. Scytale (Linn.), as follows, viz.: 
Length, 193/’, tail 2’” long; is flat and eel-shaped, like that of the Nalla 
Wahlogillee Pam. Head, hardly broader than the neck, small, roundish, 
obtuse; 12lamine ; mouth narrow; three rows of teeth in upper jaw ; eyes 
lateral; nostrils vertical, gaping; trunk, neck round and smooth ; scales 
small, ovate, imbricate; back carinated; sides sloping, belly roundish, 
