1849.] Catalogue of Malayan Fishes. 1411 



Gen. Hypolophus, Miiller und Henle, 1837. 



Form of the body like Trygon, Tail beneath with a fin, not extend- 

 ing to the apex. Upper fin absent. Differs principally from Trygon 

 by the peculiar form of the mouth and the teeth. The centre of the 

 lower jaw is pointed and projecting, and has on each side a forwards 

 directed cavity. The margin of the upper jaw is excavated in the cen- 

 tre to receive the point of the lower jaw, and is very convex on each 

 side. Teeth like paving stones, hexagonal, broader than long ; in the 

 upper jaw the teeth of the centre are small, those of the sides large ; in 

 the lower jaw they are nearly of equal size : the external ones smaller. 



Hypolophus sephen, (Forskal.) 



Raja sephen, Forskal : Descr. 17, No. 16. 



Raja sephen, Lacep. I. 123. 



Raja sephen, Bl. Schn. 364. 



Russell, III. Wolga Tenkee. 



Raja sephen, Shaw, V. 288. 



Raja sephen, Var. Shaw V. 289. 



Trygon sephen, Cuv. R. A. II. 399. 



Trigon sephen, Riippell : Atlas, 52. 



Trigon forskalii, ibid. 53, Taf. XIII. Fig. 2. 



Trigon sephen, Riippell : Neue Wirbelth. Fische, 69, Taf. XIX, 



Fig. 5, (Teeth.) 



Hypolophus sephen,Muller undHenle, 170. 



Hypolophus sephen, Bleeker: Verh. Bat. Gen. XXII. 6. 



(Young.) Above reddish brown ; the scaly portion of the head, 

 back and tail lead-coloured ; tail behind the spine, and caudal fin black- 

 ish brown ; beneath whitish. Iris golden ; pupil transversely oval, 

 black. 



Habit. — Sea o/Pinang, Malayan Peninsula 3 Singapore, 



Bay of Bengal, Mouths of the Ganges, Red Sea, Indian 

 Ocean, Java, Madura. 



The disk is rhombic, with rounded angles. In the very young the 

 snout is more pointed than in the older. The external angles of the 

 ventrals are acute, the internal obtuse. The distance between the nos- 

 trils is one half of their distance from the snout. The distance from 

 the snout to the eyes exceeds by one third that between the eyes. The 



