169 
Scopelus engraulis Alcock, Ann. Mag. Nat. Hist. (6) VIN. 1891, p. 129. — 
Descr. Catal. Indian Deep-Sea Fishes, 1899, p. 161. 
Scopelus (Nyctophus) caeruleus Liitken, Spolia Atlantica, Scopelini, 1892, p. 260. 
Lampanyctus caeruleus Goode & Bean, Oceanic Ichthyol. 1896. p. 81. 
Myctophum (Diaphus) caeruleum Brauer, Deutsche Tiefsee-Exp. Ticfseefische 
1906, p. 217. 
Diaphus caeruleus Max Weber, Siboga-Exp. Fische, 1913, p. 88. 
De 12-14: A. ths P, t0—12; Ve 8—o; L137. 
Height 4°/,—5, head 3'/,—37/,, eye 4—5, more than half its 
diameter longer than snout, which is half as broad as interorbital 
space. Upper jaw slightly dilated at its hinder end, which sur- 
passes the eye by more than one eye diameter. Origin of 
dorsal above origin of ventrals or slightly before or behind it; 
in the middle of the distance between snout and adipose fin 
or behind it. Origin of anal somewhat behind end of dorsal, 
before last '/, of length, ending below adipose fin. Pectorals 
far below middle of height, not reaching origin of ventrals 
(after Brauer: reaching on ventrals). Caudal forked. Scales 
cycloid. Luminous organs divided by a black septum. An 
antorbital organ, narrowed between eye and nostril, slightly 
dilated dorsally, more dilated ventrally, extending on ventral 
border of eye. 2 operculars, quite close above each other, the’ 
ventral one, which is smaller, behind end of upper jaw; 3 
branchiostegals; 5 PO, the fourth outside the series above the 
space between the third and the fifth, The 2 PVO in an 
oblique lifie, the superior at the ventral base of the pectoral, 
the inferior above and behind the first PO. PLO above base 
of pectoral, nearer to it than to lateral line. 5 VO, the second 
and third outside the series, the third higher than the second. 
11 AO in two groups, the anterior above the anal with 6 
organs, the anterior and posterior of which are situated higher 
up outside the series, the posterior group behind anal contains 
5 organs, separated from them the 4 Prc, which are arranged 
in a continuous, semicircular series, the hindermost in the 
middle between lateral line and ventral profile. VLO between 
lateral line and ventral, nearer to lastnamed; the 3 SAO in 
an oblique ascending line, the most ventral between last VO 
and anus, the uppermost far distant from lateral line, as also 
the Pol, which lies close above and behind the last organ of 
the anterior AO. Silvery, back blackish blue. Fins hyaline. 
Length more than 150 mm. 
