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 the eye and 
slightly in front of the hind edge of the maxilla. Snout massive, short, 
steep below the chin and on the forehead, broadly rounded across the end, 
with a concave naked indentation, in which the illicium rests, reaching up 
through 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. Tllicium (first dorsal spine) little 
forward of the nasal sacs, twice as long as the eye, with a single free joint, 
the 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 XVIIL., 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 thé 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 papilla. 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 XVL., 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. 
