. 51 ? <5 
2 • Mouth terminal; no lateral scaleless nuchal 
fossa; scales cycloid, not modefied at dorsal 
and anal bases; gill rakers long, slender; 
second dorsal much higher than anal*-- 
----Bathygadus. 
2 • Mouth inferior, snout greatly extended, scaleless 
fossa each side of nape; scales rough, strongly 
modified series along front parts of dorsal 
and anal bases; second dorsal little higher than 
anal.-*— -— Trachyrinchus. 
Lyconinae. Dorsal single, front rays mostly elevated; 
head moderate; few enlarged canines; teeth on vomer; 
mouth terminal; no barbel; scales cyloid; ventrals not 
reduced.-Lyconus. 
M acruroidinae . Dorsal single, uniformly low; head very 
massive, soft; teeth in bands, in jaws only; mouth 
inferior, below and behinB eye; ventrals very small 
or absent. 
Ventrals small, rays 5; pectoral 25; mouth 
behind eye; gill membranes free from isthmus; 
gill rakers long; pseudobranchiae present.-— 
- -—— --—Squalogadus 
Ventrals absent; pectoral 16; mouth below eye; 
gill membranes joined to isthmus; gill rakers 
short; no pseudobranchiae.----— 
---- Macrouroides 
