459 
o2. Nostrils lateral, front 
one in short tube; 
teeth uniserial or bi¬ 
serial. Xenoc ongrldae . 
rr — > »ni—i j'iHi.i i iy mg 
n 2 • Snout and jaws much prod¬ 
uced, upper longer. 
P'"» Snout and jaws straight; 
vent distant from 
gill openings. 
Nettastomidae * 
j‘ : . Snout very short, obtuse; teeth 
small, in broad short villiform 
bands; pectorals long. 
Macrocephenchelyidae• 
— 
i • Vent close behind gill opening; pect 
orals present or absent. 
Dysommedae. 
2 . ———————— 
h » Hind nostril close to edge of upper 
lip; tongue more or less fully ad- 
nate to mouth floor; teeth subequal. 
Bchelidae . 
g 2 * Tail tip without rays, projects as firm 
point beyond dorsal and anal; hind nos¬ 
tril on edge of upper lip; front nos¬ 
tril near snout tip, usually in small 
tube; tongue usually adnate to mouth 
floor. 
Ophichthyidae• 
