70 DEEP SEA FISHES. 



length of the upper jaw from the front of the orbit, nearly five and one 

 third times in the greatest length of the head. Wider than the interorbital 

 space. Orbits rising above the outlines of the head, a sharp ridge from each 

 passes back to meet in the median ridge on the nape. Forehead nearly 

 straight longitudinally ; interorbital space concave ; crown narrowing back- 

 ward to a point at the occipital crest ; flat in the internarial region. Gill 

 covers long, reaching above the base of the pectoral, flexible, striate as if 

 containing a large number of fine rays. Four gills ; rakers small, short, 

 sharp ; gill openings wide, membranes united for a short distance, free from 

 the isthmus. Pseudobranchia? well developed. Body cavity two and two 

 fifths times the greatest length of the head. Seventeen pyloric cajca. La- 

 teral line descending to a point near the end of the pectoral, thence con- 

 tinuing backward below the median line of the body, parallel to the lower 

 edge, to the end of the tail. 



Dorsal moderately deep in the middle, rays slender, longest ray half as 

 long as the head, second ray above the upper angle of the gill opening, fin 

 becoming rudimentary or obsolete backward on the tail. Anal fin rudimen- 

 tary, traced by low compressed, blade-like spines the greater portion of 

 which have a point directed forward in addition to that directed back. 

 Pectorals small, pointed, as long as the upper half of the snout. 



Sides brilliant silvery; lower half of the dorsal fin light; crown, upper 

 edge of the dorsal, and the slender portion of the tail darker. 



TEUTHIDIOIDS. 



TEUTHIDID^E. 



Teuthis elegans sp. n. 



Plate L', fifj. 2. 



D. 9 + 22; A. 3 + 21; V. 1 + 5; P. 14; transverse ridges, at the LI., 

 ca. 75. 



The young fishes from which the following description is taken do not 

 properly belong with the deep sea fishes ; they are introduced, as is the 

 case with several others of the pelagic species, for purposes of comparison. 



