1889.] A. Alcock— List of Pleuronectidie from the Bay of Bengal. 283 



border of the preopercle. But for these characters it is impossible to 

 distinguish the one species from the other, eyen by colour. Found in 

 the more shallow and turbid waters. 



7. PSEUDORHOMBCS TRIOCELLATTIS, (Blooll). 

 Glinther, Oat. iv, 428 ; Day, Fishes, 424i ; Bleeker, Atl. lohth. torn, vi, p. 29, 

 pi. coxxsix, fig. 1. 



This is a very common species. It was taken everywhere usually 

 in 7 to 8 fathoms and on sandy bottoms, where its coloration is much 

 more brilliant than in turbid waters. 



8. Rhomboidichthts azureus, n. sp., PI. XVI, Fig. 3, 

 D. 84. A. G4. L. 1. circ. 55. 



This species approaches very closely to the description of B. Ico- 

 pardinus (Giinther, Cat. iv, 434), but its scales are much less mimerous 

 — 55 rows instead of 80,— and they are remarkably deciduous. 



Body oval, its height being a little over half its length, without the 

 caudal. The head is short and deep, with the anterior profile concave 

 between the eyes, its length 3f in the total without the caudal, and 

 considerably less than its height. The snout projects conspicuously, its 

 length is hardly half the diameter of the eye, and in the male it bears 

 a short horizontal horn. The length of the eye is two-sevenths of the 

 length of the head ; the inner orbital margins are very sharp and 

 in the male knobbed. The lower eye is nearly half a length in advance. 

 The iuterorbital space is deeply concave, scaly only in its posterior half, 

 and in the male is nearly one diameter, in the female half a diametei" 

 of the eye in width. 



The nostrils on the blind side are very minute. 



The cleft of the mouth is narrow and almost vertical ; the length 

 of the maxilla is contained 3f times in the head-length. Teeth in a 

 single series in the upper and a double series in the lower jaw ; they are 

 close-set, sharp and uniform like the teeth of a comb Gill-rakers few 

 and distant, on the first arch there are only six. Integument covered 

 with delicate deciduous scales, which are ctenoid on the coloured, 

 cycloid on the blind side. Lateral line with very prominent tubes, 

 and with a strong curve above the pectoral. Fins. Dorsal with its 

 longest rays in the anterior part of its last half, where they equal nearly 

 half the head-length. A projection of the humeral arch forms a sharp 

 spine in front of the anal fin. 



Length of caudal 5| in the total ; tkere are 17 rays. The pectoral 

 on the coloured side is the more developed, having 10 rays, while the 

 right has only 9. The left ventral is much longer and broader than the 



