713 
Genus Stemonldlmn Gilbert 
Stemonidlum GILBERT, Bull, U, S, Fish Comm,, vol, 23 , pt, 2, 1303» 
( 1905 )# p, 586, Type Stemonidium hypomelas GILBERT, monotypic. 
Body narrowly band shaped, trunk constricted and long tail taper¬ 
ing, Head longer than trunk. Jaws tapering to very slender weak tips. 
Eye small, little advanced in head. Teeth reduced to small granular 
plates, in quincunx in jaws and on vomer. Nostrils 2 short slits be¬ 
fore middle of eye, posterior longer. Gill slits long, oblique, con¬ 
fluent below, membranes united and free from isthmus. Gills 4, No 
lateral line. Dorsal begins little before anal. Pectoral small. 
