472 OI'mOCKPHALID^li. 



from the Hardwicke Collection. The colour is yellowi.sh, with a 

 rosy shade on the back and an oblong rosy blotch on the giU-covers. 



Var. basalis. 



A white transverse streak across the base of the pectoral ; several 

 others behind, alternately blackish and whitish. • 



g-h. Adult and young. From the Collection of the East India 

 Company. 



This species lias a black ocellus edged with white on the hindmost 

 part of the dorsal fin when young. 



i. Young. East Indies. Presented by G. R. Waterhouse, Esq. 



4. OpMocephalus kelaartii. 



D. 31-35. A. 22. L. lat. 38. L. transv. 4/8. 



Several teeth in the lower jaw and on the vomer are somewhat 

 larger than the others. The maxillary extends to the vertical from 

 the posterior margin of the orbit. The length of the caudal fin is 

 one-fifth of the total. 



Ceylon. 



a, b, c-l. Fine specimens. Ceylon. Purchased of Mr. Cuming. 



Description. — This species is allied to 0. gachua, differing from it 

 by its longer caudal fin. The height of the body is contained seven 

 times in the total length, the length of the head four times. The 

 width of the interorbital space is much more than the length of the 

 snout, and two-sevenths of the length of the head. The cleft of the 

 mouth is of moderate width, the maxillary extending to the vertical 

 from the posterior margin of the orbit. 



The teeth on the vomer and the palatine bones stand in a single 

 series, and several of the former and of the lower are somewhat 

 larger than the rest. The scales on the upper surface of the head 

 are large, plate-like ; there are five series of scales between the eye 

 and the angle of the praeoperculum. The pectoral extends to the 

 origin of the anal fin, and its length equals the distance of the eye 

 from the end of the operculum, and is more than twice the length of 

 the ventral fin. Caudal somewhat pointed. Greenish -olive (in spirits), 

 with very indistinct small darker spots ; vertical fins wdth a whitish 

 margin ; pectorals dotted all over with greyish; ventral fins colourless. 



Length sixty-six lines. 



5. OpMocephalus rhodotssnia. 

 Bleeker, Borneo, v. p. 425. 



D. 41. A. 24. L. lat. 50. 



No large teeth. The height of the body is one-eighth or one- 

 ninth of the total length, the length of the head one-fourth, the 

 length of the caudal two-ninths. The maxillary extends to below 

 the eye. The pectorals are much longer than the ventrals. Black- 



