BY J. DOUGLAS OGILBY. 85 



line. There is a singular • well-marked black elongate streak, 

 margined with a scarcely perceptible yellow border, extending 

 over five of the upper rays of the caudal fin, which latter is some- 

 what rounded terminally. 



Total length 4|, length of body 4, of head 1^, of snout -^-^, 

 greatest depth of body ij, least depth of body \ inches, diameter 

 of eye 6 millimeters. 



In the above description the number of the fin rays and of the 

 series of scales agrees fairly well, especially as regards the increase 

 (over all the other known species) in the dorsal sjjines and the 

 decrease in the anal rays.* The discrepancy in the enumeration 

 of the transverse series of scales may be explained away by the 

 fact that my computation was made at the point where the 

 greatest number of scales occurred between the dorsal profile and 

 the lateral line, while Mr. Johnston's was taken at some anterior 

 point, possibly from the origin of the dorsal fin. 



The two specimens (Johnston's and Morton s) were almost of 

 the same length — -100 mm. and 95 mm. without the caudal fin 

 respectively, and the comparative measurements should therefore 

 bave been identical or at least approximate, and such we find to 

 be the case so far as the depth of the body is concerned; but here 

 the similarity ceases, for in Johnston's specimen the head is said 

 to be contained three and one-third times in the total lenoth 

 with the caudal fin and three times without it, while in ni}' 

 specimen the head is four and two-fifths in the total length 

 without the caudal, and even if the cutaneous appendage to the 

 opercle should be included this measurement is only reduced to 

 four and one-fifth Again Johnston's measurements show the 

 eye — which he describes as- " rather large "' — to have been con- 

 tained five and a half tima^ in the length of the head and twice 



* Mr. Johnston has recorded three spinous rays as heing present in the 

 anal Hn of liis exampU', bat a most careful investigation under the micro- 

 scope, both by Mr. W'hitelegge and myself, has been ' unsuccessful in 

 bringing to liglit nmre than a single spine in Mr. Morton's tish. 



