320 DEEP SEA FISHES. 



separated by a space about equal to the width. Vent at the end of the 

 anterior third of the total length. Dorsal low anteriorly, first ray above 

 the gill opening, containing three hundred and ninety-seven rays in the 

 present specimen. Anal deeper than the dorsal, first ray below the one 

 hundred and thirteenth ray of the latter (in a second specimen below the 

 one hundred and fifteenth). Caudal narrow, of twelve rays, acuminate, 

 continuous with dorsal and anal; caudal region slender and whip-like. 



Four specimens at hand vary in regard to the position of the first ray of 

 the anal, which lies below the ninety-third to the ninetj^-fifth rays of the dor- 

 sal. Otherwise there is no apparent specific distinction between the lots. 



Black, tinted with chocolate brown over the muscular portions, lighter 

 below the head and on the edges of the fins, tentacle tipped with white. 



NEMICHTHYIDtB. 

 Serrivomer sector sp. n. 



Plate LXIII. 



Br. r. 7; D. 159-165; A. 161-160; P. 6-7 ; C. 6. 



Slender, elongate, moderately compressed, tapering from the body to the 

 snout and to the end of the tail ; body cavity in the anterior third of the 

 entire length. Head long, slender, deeper than wide, gradually decreas- 

 ing in size from the occiput to the end of the snout, nearly one fifth of the 

 total length. Snout long, acute, two fifths as long as the head, six times as 

 long as the eye. Mouth wide, less than half as long as the head, extending 

 little behind the orbit; maxillaries not reaching to the end of the snout by 

 about one fourth of the length of the latter, slender, not expanded at 

 the end. Jaws posteriorly stronger, anteriorly slender; lower jaw one half 

 the orbital length longer than the upper; lower corner of the angular 

 resembling a short spine. Three forms of teeth on each jaw, Plate LXIII. 

 fig. 3, the outer of several rows, very small, compressed, subtriangular, 

 sharp-edged ; the median of a single series of longer, lancet-shaped depress- 

 ible teeth ; and the inner of less developed, less compressed teeth, not 



