DACTYLOSTOMIAS FILIFER 279 



Dactylostomias gen. n. 



Body compressed, elongate, scalelcss ; vent far behind the middle. Head 

 narrow, pointed. Gill openings wide; membranes not nnited, free from the 

 isthmns. Moutli 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 pseudobranchiaj ; no cteca. 



Dactylostomias filifer sp. n. 

 Plate L VI. fig. 6. 



D. 13 (12-14) ; A. 15 (14-16) ; V. 5 ; P. 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, nearl}^ 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. P]ye 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 tliird 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, denticnlations, 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 pseudobranchia?. 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 



