Macrostoma, 61 
slender, much nearer posterior end of base of dorsal than to base of caudal; anal 
beginning under the eighteenth scale of the lateral line ; length of it base about 13 in 
head and equal to that of head without snout; its longest ray about 14 in head. 
Pectoral placed rather low, slender, extending a little over half the way to the insertion 
of ventral ; ventral inserted a little nearer to insertion of pectoral than to that of anal; 
its tip hardly extending to vent; caudal moderate in size, deeply forked ; vent just in 
front of anal. Scales moderate, their posterior edge strongly toothed ; caducous, a few 
scales persisting on the lateral line and under surface of body ; those on the former 
not much larger than those on the latter. Lateral line high, concurrent with the 
contour of back. All the fins without scales. 
Photophores :—The photophores of this species are like those of Scopelus 
elongatus described by Raffaele in Mittheil. Zool. Stat. Neapel, IX, p. 185, pl. VI, 
fig. rt and of Notoscopelus quercinus described by Good and Bean, in Oceanic 
Ichthyology, pp. 83-84, pl. XXVIJ, fig. 83, the differences being very trifling. Three 
photophores on mandible, one just behind angle of preoperculum ; pectorals four and 
thoracics seven in number, of which the lowest pectoral and the posterior six thoracics 
form a strongly curved row with the convexity directed downward; a pectoral on 

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