cccv 



extends ley ond the angle of the mouth. Teeth with a sharp triangular cusp, 

 sometimes dilated. The first dorsal fin, destitute of a spine, is placed 

 opposite the interspace between the pectoral and ventral : caudal with a 

 distinct lower lobe. 



897. Car char ias Gangeticus, Mull, and Henle. Teeth 27 ' 30 Of a 



27-30* 



grey colour. This savage ground-shark ascends all the large rivers of 

 India and to above tidal influence; it attains 5 feet in length. 



Sub-Order BAT 01 DEI, OR RAYS. 



Body depressed, forming, due to largely developed pectoral 

 fins, a more or less flat disc, and having a thin and 

 slender tail. Spiracles present. Gill-openings in five 

 pairs, inferior. Dorsal fin, when present, on the tail : 

 anal absent. 



Family P n i s T I D JB. 



Snout much produced, flattened, and having a saw-like appearance, due to large teeth 

 existing along its lateral edges. 



Genus PKISTIS, Latham. 



Body elongate and depressed. Gill-openings inferior and of moderate 

 width. Spiracles wide and posterior to the eye, which latter has no nic- 

 titating membrane. Nostrils inefrior, without tentacles. Teeth minute. 

 Dorsal fins spineless : the first quite or nearly opposite to the ventrals : front 

 edge of pectoral free. 



398. Pristis cuspidaf.us, Latham. Mahanuddi and Irrawaddi 

 Rivers, ascending far above tidal influence. 



v 



Family T RYGONID^. 



Body flattened and disc-shaped, with a long and slender tail. Pectoral fins are conti- 

 nued forwards anteriorly and laterally to the end of the snout. No lateral longi- 

 tudinal folds to the tail. Vertical fins, if present, in the form of a serrated spine. 



Genus TRTGON, Adanson. 



Nasal valves coalesce and form a triangular flap. Teeth flattened. 

 Pectorals continued forwards to the lateral edge of the snout. Tail long, 

 whip-like, either destitute of any fin, or with cutaneous folds, which do 

 not extend its entire length : armed superiorly with one or two serrated, 

 lanceolate spines. Body smooth or tuberculated. 



3$&. Trygon uarnak, Forsk. Sankush, Ooriah. Ascends rivers, 

 often above tidal influence. 



400. Trygon sephen, Forsk. This species is also frequently captured 

 above the influence of the tides. 



