338 DEEP SEA FISHES. 
Atopichthys longidens sp. n. 
Plate LXVII. fig. 5, da. 
Comparatively short, much compressed, greatest depth near one seventh 
of the total length, forward of the middle, depth decreasing but little until 
near the extremities. One hundred and forty transverse muscular segments, 
of which fifty-one are forward of the vent. A rather wide transparent mar- 
gin, dorsal and anal, outside of the muscle-segments. Head small, about 
one thirteenth of the total; pointed in front, little wider than the body. 
Snout acute, two fifths as long as the head, one and two thirds times as 
long as the eye; the shape in some degree suggestive of the snout of Thyr- 
sites. Eyes large, three fifths as long as the snout, nearly one fifth of the 
length of the head, with lateral outlook. Mouth large; maxillary reaching 
backward of the middle of the eye; jaws nearly equal in length. Teeth 
large, acicular, very slender, inclined obliquely. forward, gradually becoming 
smaller backward, an anterior pair of large canines protruding on each jaw. 
Nostrils small, posterior near the eye, anterior about midway from the eye 
to the end of the snout. Gill openings medium, forward of and below the 
level of the bases of the pectorals; membranes united, joined to the isthmus. 
Vent below the fifty-first muscular band. 
Pectorals broad, as long as the snout. Dorsal and anal apparently a 
thin transparent membrane without visible rays, continuous with the caudal 
but becoming very narrow toward the base of the latter. Caudal fan- 
shaped, the rays radiating from the base, rounded or blunt pointed on the 
hind margin. 
Transparent; with black pigment in a pair of dots above the angle of 
the jaws, in a series of three or four a little farther backward, in a group of 
six still farther back — below the throat, in a series of closely set ones along 
the upper edge of the intestine, and in one or two series along the median 
line of the flank. The dots along the flank make their appearance a short 
distance behind the head and are—2in the median line —placed in the 
groove between the bands of muscle with, near the middle of the entire 
length, occasional dots on the muscle of the bands between the dots in 
the grooves. Not far from the origin of the median series and close below 
the latter a second series begins, the dots of which are also placed in the 
grooves ; it continues almost to the end of the series above it. 
