156 
rays. Pectorals situated much nearer to lateral line than to 
ventral profile, extending on anal. Ventrals reaching anus. 
Caudal forked. Scales cycloid, very deciduous. Luminous organs: 
a small dorsal and ventral antorbital on frontborder of orbit, 
two at the praeopercular margin, the larger dorsal one nearly 
on the level of the ventral margin of the orbit. The smaller 
ventral behind the maxilla, 3 branchiostegal ones. 5 PO ina 
series between isthmus and pectorals, the posterior PVO at 
the lower base of the pectorals, the anterior before it in a 
ventrally oblique direction, above the second PO. PLO below 
lateral line. 4 VO along the ventral profile. Anterior group of 
AO with 4—7 organs above anterior ?/, of anal. Posterior group 
6—8 organs, the posterior of which are behind the anal. The 
most frequent formula of AO is 5-46; distant from the latter 
group but at the lower profile is the anterior Pre, the posterior 
high up in the lateral line. The 3 SAO forming a blunt angle, 
dorsally open, the anterior above and slightly before the third 
VO, the second in the vertical through the vent, the posterior 
in the lateral line. Of the 2 Pol the hindermost and superior 
in the lateral line, above the interspace between the anterior 
and posterior AO, the lower Pol above or slightly before the 
last organ of the anterior AO. Length 25 mm. 
Habitat: Banda Sea (surface plancton)!; Halmaheira Sea 
(1000—o M., vertical net)!. — Tropical part of Indic; Coast 
of Chili; Atlantic between 34°N. and 31°S. 
3. Myctophum laternatum Garm. |Fig. 58 p. 152]. 
Myctophum laternatum Garman, Exp. Albatross XXVI. Fishes, 1899, p. 267. 
Myctophum (Myctophum) laternatum Brauer, Deutsche Tiefsee-Exp. Tiefseefische, 
1906, p. 178. 
Myctophum laternatum Max Weber, Siboga-Exp. Fische, 1913, p. 86. 
D. 11—12; A. 15—16; P. 1o—11; V. 8; L.1. 32—34. 
Somewhat robust and short. Height 4—4'/,, head 3—3'/,, eye 
3—3'/,. Snout about in twice eye, very blunt, with a median inter- 
narial ridge. Maxillary extending to vertical through hindborder 
of eye or slightly farther, dilated posteriorly. Opercle broad; 
anterior border of praeopercle vertical. Origin of dorsal slightly 
before middle of length, behind vertical through ventrals. 
Origin of anal below hindmost rays of dorsal. Adipose fin 
above the posterior half of the anal. Pectorals reaching be- 
