BY J. DOUGLAS OGILBY. 73 



longest, but little longer than the diameter of the eye, and 14 to 

 2 in the length of the base, which is greater than that of the 

 dorsal fin and much greater than its distance from the caudal ; 

 the last ray is thickened and divided to the base and extends 

 when laid back about one-third of the distance to the root of the 

 caudal : ventral fin inserted midway between the extremity of 

 the mandible and the base of the caudal, with convex outer 

 border, the first ray simple and a little longer than the second, 

 14 to 2 i in the length of the head : pectoral fin with the outer 

 border rounded, the second ray simple and not so long as the 

 third and fourth, which are the longest, 1| to If in the length of 

 the head : caudal fin forked, with tine lobes equal, its length ly'y- 

 to 14 in that of the head; the least depth of its peduncle is a 

 little more than its distance from the anal. 



Scales with inconspicuous carinas radiating from the base ; 

 axillary scale of the ventral rather small and lanceolate, its 

 length about two-thirds of the diameter of the eye; dorsal serra- 

 ture much weaker than the abdominal, originating immediately 

 behind the occiput, and consisting of from twenty-eight to thirty- 

 one keeled scutes; twenty or twenty-one scutes in advance of and 

 fourteen behind the origin of the ^'entral fin, those immediately 

 in front of the fin the smallest. A single coarse stria descends 

 obliquely downwards and backwards from the origin of the 

 lateral ridge of the occiput across the temporal region, the space 

 intervening between it and the eye smooth; a small triangular 

 area on either side of the occiput smooth or inconspicuously 

 rugose; opercle with a more or less prominent stria parallel to 

 and near its anterior border, its upper third with feeble radiating 

 striae. Surface of the head almost entirely covered by a network 

 of ramifying mucous canals, which extend over the five or six 

 anterior scales of the humeral region in the form of a corselet 

 and are overlaid by a delicate transparent epiderm. 



Pale greenish-silvery, with an obscure, dark-edged, silvery 

 lateral band which becomes more prominent upon the tail and 

 bifurcates at the root of the hypural bone; above this band all 

 the scales are provided with a marginal series of blackish dots; 



