Ill 
Family ARGENT IN IDAE 
Body elongate, abdomen rounded. Mouth terminal, small or large. Max¬ 
illary forms lateral edge of upper jaw, with supplemental bone. Premaxil- 
laries not protractile. Teeth various, sharp pointed. Pterygoids toothed. 
No barbels. Gill membranes separate from isthmus, Gills 4, slit after fourth. 
Branchiostegals 5 to 10. Stomach blind sac, with'few or no appendages. Air 
vessel single, large. Ova large, fall into abdominal cavity before exclusion. 
Scales moderate or small, usually cycloid. Head naked. Lateral line present. 
No photophores. Dorsal short, nearly median. Adipose fin always present. 
Anal moderate. Caudal forked. r ectoral low. v entral moderate, nearly median. 
Small marine fishes, many ascending streams in the spawning season. They 
are reduced salmonoids, smaller and weaker than trout, from which they differ 1 - 
otherwise largely in the stomach, ^ost are excellent food fishes. Included 
here are only the deep water forms belonging to the genus Bathylagus . 
* 
■5” 
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v.. ., i .i 
Genus BATHYLAGUS Gunther 
t! 
Bathylagus GUNTHER, Ann. Mag. %t. Hist., London, ser.5, vol.2, 1878, p.248. 
Type Bathylagus antarcticus GUNTHER, designated by JORDAN, Genera of Fishes, 
pt.3, 1919, p.395. 
Body oblong, compressed. Head short, compressed, bones thin and membran¬ 
aceous. ^ye large, ^outh narrow, transverse, anterior. Upp er teeth very 
feeble or rudimentary, lower very small, on jaw edges forming fine serrature. 
Series of minute teeth across vomer and along each palatine. Gill opening 
narrow, begins opposite pectoral base and extends across isthmus. Gill mem¬ 
branes united, free from isthmus. Gill rakers lanceolate, rather long. Gills 
