DACTYLOSTOMIAS FILIFER. 279 
DACTYLOSTOMIAS gen. n. 
Body compressed, elongate, scaleless ; vent far behind the middle. Head 
narrow, pointed. Gill openings wide ; membranes not united, free from the 
isthmus. Mouth large. Teeth rather long, unequal, upper passing outside 
of the lower jaw, anterior canines fixed, hinder teeth depressible. Palatine 
and lingual teeth present. Maxillary denticulate. Eye lateral. <A hyoid 
barbel. A suborbital luminous organ, Dorsal near the caudal, opposed to 
the anal. Caudal forked, separate from dorsal and anal. Ventrals small, 
widely separated, near the middle of the length. Pectorals of one ray, fila- 
mentary, low on the side. No pseudobranchiz ; no cxea. 
Dactylostomias filifer sp. n. 
Plate LVT. fig. 6. 
Wat seGi2=14) Aco) @l4=16))7 Vo o> PB. 1: 
Moderately elongate, deeper than wide, depth three fourths of the length 
of the head, and about one eleventh of the entire length. Head narrow, 
short, nearly one eighth of the total, rather sharp at the snout, convex 
across the crown and slightly so from the snout backward. Snout medium, 
one and one third times as long as the eye, equal in length to the width 
of the interorbital space, subconical, blunt. Eye of moderate size, three 
fourths as long as the snout. Barbel very slender, about twice as long as 
the head, with a small bulb at the end. Mouth wide; jaws almost equal 
to the head length. Teeth slender and sharp; six to eight on each inter- 
maxillary, of which the first is fixed, the second largest and with the others 
depressible, passing outside of the lower jaws; first and third teeth on each 
lower jaw fixed, on the outer aspect of the bone, and passing outside of the 
upper jaw, second tooth largest and with the fourth to the eighth depress- 
ible ; small immovable teeth, denticulations, appear on the maxillary and 
opposed to them on the hinder part of the lower series; a pair of strong 
hooked teeth on the forward part of the tongue and behind these a short 
distance a second pair; a short series of small teeth on each palatine. Gill 
membranes not united, free from the isthmus. No pseudobranchiw. A 
rather large luminous organ near the maxillary immediately behind a ver- 
tical from the posterior border of the orbit. No other light organs were 
