i S 6 



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 in a 

 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 2 / 3 of anal. Posterior group 

 6 8 organs, the posterior of which are behind the anal. The 

 most frequent formula of AO is 5 -\- 6 ; distant from the latter 

 group but at the lower profile is the anterior Prc, 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 Indie; Coast 

 of Chili; Atlantic between 34 N. and 31 S. 



3. Myctophum laternatum Garm. [Fig. 58 p. 152]. 



Myctophum laternatum Carman, 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. II 12; A. 1516; P. 10 II; V. 8; L.I. 3234. 



Somewhat robust and short. Height 4 4^5, head 3 3^5, eye 

 3 3 ! /5- 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- 



