84 DEEP SEA FISHES. 



chin steep ; sides almost vertical, concave below the orbit, with a prominent 

 angle below the articular on a vertical from the front edge of tlie eye and 

 slightly in front of the hind edge of the maxilla. Snout massive, short, 

 steep below the chin and on the forehead, broadly romided across the end, 

 with a concave naked indentation, in which the illicium rests, reaching up 

 throngli the interorbital region. Nasal sacs as large as the eye, equally 

 distant from the front edge of the maxillary, the eye, and the illicium ; 

 anterior nostril subtubular, the hind edge being much higher ; posterior 

 nostril much the larger, close to the orbit. Illicium (first dorsal spine) little 

 forward of the nasal sacs, twice as long as the eye, with a single free joint, 

 tlie upper end of which swings forward in front of the mouth, and with a 

 basal piece slightly mobile applied to the top of the skull (Plate XVI., fig. 

 1, Plate XVII. , fig. 2), and also with an esca that is a fleshy bulb covered 

 with short filaments, on the front side of the upper end of the staff. The 

 illicial niche has the shape of an elongate horse-shoe, and receives the entire 

 rod and bait when the latter are at rest (Plate XVII., fig. 1); its cavity is 

 lined with naked skin, and its margins are surrounded by small spines. 

 Mouth wide, rising steeply forward ; maxillary extending backward to a 

 vertical from the forward edge of the eye, toothless, not entering the border 

 of the mouth, moderately widened and rounded at the end. The great 

 process below the articular is nearly vertical and forms an angle with the 

 jaw that is somewhat greater than a right angle ; the process approaches its 

 fellow of the opposite side of the head below the throat ; it does not extend 

 forward, as in Chaunax Nuttingii Garm., which indicates one of the most 

 prominent differences between the two forms. Labial folds not crossing 

 the symphyseal one-third of the united lengths of the mandibles. Tongue 

 large, thick, broad, rounded, toothless, with scattered small papillte. Teeth 

 small, subconical (Plate XVI., figs. 3 and 4), in villiform bands on the jaws, 

 and in two short transverse bands, separated by a space of equal length on 

 the vomer. Eye medium, lateral, length nearly half of either interorbital 

 width or length of snout. Gills two and one half, lamellae short ; rakers 

 short rounded spinule covered tubercles, ten on the first arch ; gill openings 

 as wide as the eye, above the axilla, ear-shaped, valvular (Plate XVI., fig. 

 2); no gill on the first arch. Viscera figured on Plate XVII., fig. 7. No 

 pyloric appendages. Skin very thin and loose. Vent below the gill 

 opening, about two lengths of the eye forward of the anal fin. A small but 

 prominent genital papilla. 



