330 DEEP SEA FISHES. 



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, Sh 48" p. m., 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 LX VI. 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; uj^per 

 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 tlie 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 



