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PROCEEDINGS OF THE NATIONAL MUSEUM. 



yoL. 41. 



decurved, obtuse, its sides forming an angle of about 45 degrees, its 

 length 3.5 in head and 1.5 in distance from its tip to mouth, its 

 breadth 2.5 in head and equal to distance from its tip to mouth; 

 eye lateral, .25 head, .66 interorbital, equal to space between spira- 

 cles, the center of pupil midway between nostril and spiracle; nostrils 

 large, separated by a space somewhat greater than their diameter; 

 mouth slightly curved, very broad, .8 width of snout, .3 head, ante- 

 rior margin shghtly posterior to pupil; teeth in upper jaw small, 

 pentacuspid, the cusps lanceolate and evenly graduated; the uni- 

 cuspid teeth in lower jaw larger, the point sharp and oblique; spira- 

 cles rather large, nearly midway from tip of snout to last gill open- 



FiG. 2. — Etmopteeus brachyueus. Undee side of head. Enlarged about three-fourths. 



ing, space between spiracles equal to .5 distance from spiracles to 

 tip of snout; gill openings very narrow; entire upper surface of 

 body, top of head, caudal peduncle, and bases of fins covered with 

 well-marked longitudinal lines of overlapping spiniferous denticles 

 separated by relatively wide naked spaces, the spines longest and the 

 rows most marked on the tail; abdomen, breast, and under side of 

 snout densely covered with rough denticles without regular arrange- 

 ment; under side of head for a considerable distance before and 

 behind mouth naked, with numerous large pores. 



Each dorsal fin with a spine that is naked nearly to its base; first 

 dorsal very short, its origin nearer to posterior base of second dorsal 

 than to tip of snout, the spine about .5 height of fin; second dorsal 



