72 OPHIDIANS. 
No. 24. H.-hydr. Elliottii. Indian coast; Ceylon. 
25. - pachycereus. Indian Ocean. 
26. 3 viperina. Indian coast. 
ere i curta. Indian coast, near Pooree. 
28. Hardwickii. Penang. 
29. rs Fayreriana.* Indian coast, Bay of 
Bengal, Pooree. 
30. “« , tuberculata.* Tidal streams, near Cal- 
cutta. 
31. . erassicolis.* Bay of Bengal. 
32. * Stewartii.* Bay of Bengal. 
33. if nigra.* Bay of Bengal. 
Nos. 1, 4, 8, 10, 12, 15, 22, 27 are Giinther’s, and Nos. 
29, 30, 31, 32, and 33, are classified by Dr. Anderson. | 
Experiments made with the poison of several of these varie- 
ties prove it to be very deadly. Fangs are small and grooved, 
the involution not being so complete as in the fangs of land 
snakes. They possess a strong family resemblance to each 
other. Giinther’s general description of thé genus is as fol- 
lows, viz.: 
Posterior part of body strongly compressed; head short, or of a mod- 
erate length, shielded above; one pair of frontals ; nostrils superior in a 
single nasal; both contiguous; scales imbricate or not so, not polished, 
generally carinated; ventral shields very narrow, or quite rudimentary, 
or absent; lower jaw without the notch in front. 
Giinther describes the following, viz.: 
Species No. 1. Hydroph. Jerdoni. 
Hydrus nigrocinctus, Cantor. 
Kerilia Jerdonii, Gray. 
Abdominal scuta 235-238, bituberculate. Head short; rostrum de- 
* Anderson. 
