Genus Metopomycter Gilbert 
Metopomycter GILBERT* Bull. U. S. Fish Comm., vol. 23* pt. 2, 1503 
(1905), P* 585. Type Metopomycter denticulatus GILBERT, mono- 
typic. 
Body slender, with tapering moderately long tail. Hea d rather 
large. Muzzle long, depressed. E ye moderate, little advanced* Mouth 
cleft long, reaches hind eye edge. Teeth very small. No tongue. Front 
nostril superior near snout end, large round opening directed forward, 
in very short tube; hind nostril long slit beginning above middle of eye 
in interorbital space and pair converging backward. Gill opening rather 
small. Lateral line axial. Dorsal begins little before gill opening, 
rather high, confluent with moderate caudal and lower anal. No pectoral. 
Analysis of species 
a*. Head 2 4/5 to vent; hind eye edge well before middle of head. 
2 
a . Head 3 1/2 to vent; hind eye edge midway in head, parviceps. 
