1867.] MR. F. DAY ON INDIAN FISHES. 561 



Mouth anterior, the posterior extremity of the upper jaw reaching 

 to under the anterior margin of the orbit, but almost concealed by 

 the preorbital and thick fleshy upper lip, which has a broad fold an- 

 teriorly. Posterior limb of the prseoperculum nearly vertical, but be- 

 coming slightly oblique towards its angle, and the whole very finely 

 serrated; lower limb horizontal, entire. Operculum spineless, rather 

 higher than wide ; sub- and interopercula entire. 



Teeth. Four strong canines in the anterior part of either jaw, the 

 outer ones in the upper jaw curved outwards, as are also those of the 

 lower jaw, but to a less extent ; a single row of pointed teeth along 

 the side of either jaw, and a posterior canine. 



Fins. The dorsal spines anteriorly weak, the last being longest 

 and strongest and equal in length to the rays ; the interspinous 

 membrane extended beyond the spines and deeply notched. Pectoral 

 rather pointed. Ventral with its first ray prolonged ; its spine weak 

 and nearly equal in length to the last dorsal one. First anal spine 

 weak, half the length of the second, which is about equal in strength 

 to, but not so long as, the third. Caudal with a broad base, and 

 slightly emarginate. 



Scales cycloid, placed in horizontal rows along the body ; those on 

 the head smaller, and covering the interorbital space, the cheeks, 

 and opercula, but not the preorbital ; also forming a sheath to the 

 dorsal and anal fins, and extended over the base of the caudal. 



Lateral line composed of scales smaller than those contiguous, 

 consisting of a single tube on each scale branching posteriorly. It 

 is continuous in upper third of the body from the head to the centre 

 of the caudal fin. 



Colours. Scarlet, extended over the whole of the body without 

 any dark markings. Anal yellow, its central rays scarlet ; the dorsal 

 red, with its last few rays yellow, its sheath also yellowish. Caudal 

 red. Pectoral flesh-coloured. Lips reddish. Eyes golden, with 

 red markings. 



I have named this species after my esteemed correspondent A. G. 

 Brisbane Neill, Esq., F.Z.S. 



Hab. Madras. 



Plagusia potous, Cuv. ; Russell, pi. 73. 



B. vi. D. 107. V. 6. A. 87. C. 12. L. 1. 87. 



Length of head f of the total length. Height of body 5 of the 

 total length. 



Eyes on the left or coloured side, half of the superior being in 

 advance of the inferior, and the posterior margin of the lower orbit 

 being in the centre of the length of the head ; diameter yt ^^ length 

 of head ; 1 diameter apart. 



Body elongated and lanceolate. Mouth cleft to slightly beyond 

 the posterior extremity of the lower orbit, its angle midway between 

 snout and gill-opening. The elongated hook of the snout ends below 

 a vertical line from the anterior extremity of the upper orbit. 



Fins. Dorsal commences the length of two diameters of the orbit 

 Proc. Zool. Soc— 1867, No. XXXVL 



