I2I 
an incomplete lateral series of luminous organs, besides 2 
opercular ones, a series between the branchiostegal rays and 
a suborbital one. Head compressed, conical. Gape of mouth 
very wide, bordered superiorly by the small intermaxillary 
and the very long, slender, sickle-shaped maxillary. Infraorbital 
bone dilated, covering at least a considerable part of the 
cheek. Lower jaw projecting, with a prominent inferior pos- 
terior angle, enclosed between the maxillaries. Dorsal shorter 
than anal, the origin of both opposite or nearly so, both 
situated behind the middle. Pectorals in the lower half of 
the height. Ventrals before middle of length. Caudal forked. 
Adipose fin nearly always present. Long, fanglike teeth, rather 
regularly distributed in the upper and lower jaw, with much 
smaller ones in the spaces between them. Vomer with or 
without teeth. A series of teeth on palatines and pterygoids. 
Gillopening very wide. Gillmembranes free from isthmus. 
Pseudobranchiae none. Gillrakers very long and slender. Bran- 
chiostegal rays short, 11-14. 
Bathypelagic fishes. 
Synopsis of the species, 
1. Extremely thin, partly concealed, large scales, 2 hooked 
vomerine teeth. Origin of dorsal above the 2"¢ or 31d 
LULU MBELY POPE Se cere eee wet cst totes of aEha ot kgs, sr omental Mes G. rhodadenia p. 121. 
2. No scales. Vomer edentulous. Origin of dorsal and anal 
EET SOME MSATHOEVERELCAN SE foo) ote) Lats of el lalal eee Whaded «lets G. elongatum p. 122. 
1. Gonostoma rhodadenia (Gilbert). 
Cyclothone rhodadenia Gilbert, Bull. U. S. Fish. Comm. XXIII. 2. (1903) 1905, p. 602. 
Gonostoma rhodadenia Max Weber, Siboga-Exp, Fische, 1913, p. 18. 
Boour; Dsi43 Aw30—31; Ps 11=73)3. V. 8. 
Height about 7, head about 4'/,, eye 6—7?/,, ?/, of length of 
snout and of the interorbital space, which contains a pair of 
narrow ridges, lengthwise parallel, which fork anteriorly, the 
branches diverging to either side of nostrils, posteriorly, these 
ridges extend along the sides of the occiput where they gently 
diverge. Suborbital bone covering much less than half cheek, 
forming a sheet overlaying upper portion of maxillary for its 
entire length, Pointed symphysis of mandible very prominent. 
Gape of mouth very wide. Maxillary curved, reaching to angle 
