135 
Rafinesque , monotypic. 
Gonostomus COCCO, Huov. Ann. Sci. Nat. Bologna, vol.2, 1838, p.163. Type Gon- 
ostoma denud ata RAFINESQUE, virtually. Gnostomas COCCO variant spelling 
for Gono stoma RAF INESQUE. 
Sigm ops GILL, GILL, Pr 0 c. U.S.Nat. Mas., vol.6, 1883 (1884), p.256. Type Sigmops 
stig maticns GILL, monotypic. 
Ne ostoma FILHOL, La Mature, 1884, p.184. Type Reost oma bathyp hilum Filhol, mono¬ 
typic . 
Body oblong, compressed. Head conic, much compressed, bones thin. Eye 
moderate. Mouth very wide. Premaxillary short, not extending far below level 
of eye. Maxillary much longer, forms nearly entire jaw edge. Jaws with single 
band of strong minute teeth, unequal, minute ones alternating with long pointed 
teeth. Band of minute teeth on each palatine and pterygoids, former with few 
conic ones in front. Second suborbital more or less enlarged. Gill opening 
very wide, outer branchial arch extends forward behind symphysis of lower jaw, 
with very few gill rakers. Ho pseudobranchiae. Branchiostegals 13 or 14. Ho 
air vessel. b ca i es subequal, present or absent. Photophores on lower parts of 
body, tail and branchiostegal membranes. J orsal rays 11 to 17, postmedian, 
opposite or behind anal. Adipose fin small. Anal rays 22 to 31. Caudal forked. 
Paired fins well developed. 
ANALYSIS OF SPECIES 
1 
a. SIGMOPS. Second suborbital enlarged; scales, if present, only on front and 
hind parts of body and in association of photophores. 
1 
b* Anal origin very little before dorsal origin; adipose fin present; D* 13 
