30 DEEP SEA FISHES. 
Co 
readily distinguished from that species by the anal fin, which is nearly 
twice as long. 
Station, 3410; Lat., 0° 19’ N.; Lon., 90° 34’ W.; ‘‘ Surface Townet,” Time, 8" 48™ p.u., Apr. 3, 
1891, over a depth of 331 fathoms, for which the Temp. was 44.2 F. and the Bottom black sand. 
Atopichthys dentatus sp. n. 
Plate LXVI. figs. 3, 3 a. 
Narrow and deep, the greatest depth, near the middle of the length, is 
equal to the post anal length or nearly one eighth of the total. Upper and 
lower outlines curved throughout, converging very slowly until near the 
ends; caudal region retaining a considerable depth, blunt at the end. Head 
one seventeenth of the entire length, acute, convex across the crown; upper 
longitudinal outline straight, lower curving upward on the chin; width little 
more than that of the body. Snout about two fifths of the length of the 
head, one and one half times as long as the eye, sharp. Eye large, lateral, 
nearly one fourth of the head-length. Mouth large, cleft reaching behind 
a vertical from the middle of the orbit; prominence of the angular behind a 
vertical from the hind border of the orbit; lower jaw little shorter. Teeth 
sectorial, compressed, with a low ridge along the middle of the outside; a 
pair of large hooked canines on the upper jaws includes the similar pair on 
the front of the lower jaws; spaces separating the canines from the other 
teeth little longer than those farther back; posterior teeth of the upper jaws 
below the forward edge of the eye abruptly becoming much smaller and 
closer together and thus continuing backward. All the teeth are inclined 
forward ; the canines protrude and each pair includes a couple of small 
teeth. There are nine or ten teeth forward of the smaller crowded teeth 
in the upper jaw. Nostrils medium; posterior immediately in front of the 
eye; anterior smaller, behind the mid-length of the snout. Gill opening 
moderately wide, twice the width of the pectoral base, extending down to 
the isthmus. Muscular segments ninety-seven plus twenty-four. 
Pectorals deep and short, two fifths as long as the head, hind border 
rounded. The rays of the anal and those of the dorsal behind the vent are 
somewhat distinct ; those of the caudal are still more so and much longer. 
Caudal fin blunted at the end. 
Translucent ; muscular portions of the head flesh colored and opaque ; 
pectorals and opercles with brownish spots or cloudings; isthmus with 
