1881.] NATURAL SCIENCES OF PHILADELPHIA. Tit 



similar curvature, decreasing regularly to the caudal fin. Profile 

 of occiput and superorbital regions convex ; snout somewhat 

 produced, its upper outline slightly concave. 



Head one-fourth of total length, greatest depth a little less than 

 length of head, caudal peduncle about one-fourth of the greatest 

 depth. 



Eye round, lateral, with a slight direction upwards, its diameter 

 less than the length of the snout. Interorbital area nearly equal 

 in width to the diameter of the eye, concave transversel}', upper 

 orbital borders slightl}^ raised. 



A short nasal tentacle slightly anterior to the front margin of 

 the eye. A large fimbriated tentacle on each side of the first 

 dorsal ray. 



Cleft of mouth oblique, the lower jaw the longer ; the posterior 

 convex extremity of the club-shaped maxillary about vertical 

 with the centre of the pupil. 



Teeth of the outer row regular, sharp, incurved, the largest in 

 front, graduallv decreasing along the lateral portions of the jaws, 

 and not extending much past the middle of their length. A 

 narrow band of small teeth in the rear of the outer row. Vomer- 

 ine teeth. 



Branchiostegals six. Gill-openings continuous, membranes not 

 attached to the isthmus. 



Distance from the first ray of the dorsal to the posterior margin 

 of the eye equal to the length of the snout. First two rays of the 

 dorsal much developed, the first slightly the longer, and nearly 

 equal in height to the distance of its base from the tip of the 

 upper jaw ; third ray about half the length of the first ; fourth 

 very shoi't ; succeeding rays to the twentj^-sixth longer than the 

 third, the three last somewhat decreasing. 



Anal commencing under the eleventh dorsal raj^ ; coterminous 

 with, and equal in height to the dorsal. 



Caudal with thirteen simple jointed rays, the longest in the 

 centre, posterior margin convex. 



Pectorals narrow, lanceolate, the fifth and sixth rays longest, 

 and four-fifths the length of the head. 



Ventrals inserted in advance of the pectorals. 



Lateral line with thirty-seven simple pores, parallel with dorsal 

 outline to opposite the origin of the anal, where it is deflected 



