from the Bay of Bengal. 435 



Rhomhoidichthys angustifrons, Gtlir. 



Rhomboidichthys angustifrons, Giinther, Zool. * Cli.allenger ' Exp. vol. i. 

 pt. vi, p. 46, pi. xxi. fig. B. 



Off south-east coast of Ceylon, lat. 6° 6' 30" N., long. 

 81° 23' E., 32 fathoms ; bottom sand, shells, dead coral, &c. 



Rhomhoidichthys azureus, Alcock. 



Rhomboidichfhys aznreus, Alcock, Journ. As. Soc. Reng. vol. Iviii. pt. ii. 

 pp. 283, 284. 



Off south-east coast of Ceylon, as above, 32 fathoms. 



Also met with all along the Ganjam coast, in depths 

 ranging from 11 to 33 fathoms, and in places where the 

 bottom consists either of hard sand, or of broken shells, rock, 

 and dead coral. 



Examination of a large number of specimens shows the 

 radial formula to be 



D. 84-90. A. 64-70. C. 17. L. lat. 55. 



The lateral line on the blind side has no suprapectoral 

 curve, but simply rises gradually to the post-temporal region. 



The males of this species, in addition to the brilliant blue 

 spots on the snout, are altogether brighter coloured than the 

 females ; on the blind side too they show a large, subcuta- 

 neous, pyriform, black patch. 



Rhomhoidichthys valde-rostratus, sp. n. 

 D. 84. A. 64. L. lat. 48. 



Body pyriform ; its height very nearly half its length, 

 including the caudal. Head slightly over f of the same 

 standard in length, and half again as high as long ; its ante- 

 rior profile almost vertical. 



Snout abruptly prominent, in length barely f the major 

 diameter of the eye, bearing on its left side an advanced, 

 up-curved, bifid horn of equal length. Eyes on the left side, 

 prominent, in diameter about ^ of the head-length ; the lower 

 nearly half its length in advance of the upper ; internal orbital 

 margins strong, thick, salient, and spiny. Interorbital space 

 deeply concave, scaly, except for a narrow bridge of naked 

 skin in its anterior part ; its width is nearly a diameter and a 

 half of the eye. Nostrils small ; the anterior tubular, the 

 posterior subtubular on the coloured side. 



Mouth-cleft moderate, approaching the vertical ; the length 



