338 DKKl' SKA KJSIIKS. 



Atopichthys longidens sp. n. 

 Plate LXVII. jig. 5, 5a. 



Comparatively short, much compressed, greatest depth near one seventh 

 of the total length, forward of the middle, depth decreasing but little mitil 

 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, ahout 

 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 tlie 

 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 — in the median line — placed in the 

 crroove between the bands of muscle with, near the middle of the entire 

 leno"th, 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 tlie 

 o-rooves ; it continues almost to the end of the series above it. 



