580 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
Dorsal fins of equal length and height, separated by an interval 1.5 times their length at base, 
which equals half the width of the mouth; anterior dorsal inserted largely above base of ventrals, not 
more than one-fourth its base being behind them; second dorsal originating above middle of anal fin 
and terminating slightly in advance of its end; base of anal fin 2.3 times that of second dorsal, and 4 
times its distance from base of ventrals; pectoral with a long base, the length of which equals its dis- 
tance from base of ventral; pectoral short, rounded, its tip scarcely reaching half way to base of ventrals. 
Skin densely covered with minute slender spines, which bear no cusps at their bases; margins of 
fins and an area behind each of them naked. 
Color uniform warm brown. 
Only the type is known, an adult female containing a mature egg in each oviduct. 
Family SQUALID^. 
Squalus mitsukurii Jordan & Snyder. 
Station 4085, north coast of Maui, 267 to 283 fathoms. 
Etmopterus villosus, new species. Plate 66. 
Type, 170 mm. long, from station 3824, off the' south coast of Molokai, depth 222 to 498 fathoms; 
type, No. 51583, U. S. Nat. Mus. 
Length of head to first gill-cleft 22.5 hundredths of total length; interorbital width 8; preoral 
length of snout 11; preocular length of snout 8; least distance between nostrils 4; longitudinal 
diameter of orbit 7; distance between spiracles 7.5; width of mouth 11; distance from tip of snout to 
first dorsal spine 38; length of first dorsal spine 5; base of first dorsal 6; space between dorsals 16; 
length of second dorsal spine 8; base of second dorsal 6; length of upper caudal lobe 24; length of 
pectoral 10. 
Lateral margins of snout nearly parallel, the terminal portion very abruptly and bluntly rounded ; 
width of snout equal to that of interorbital space; anterior nasal flap narrow and pointed, the posterior 
widened horizontally and concave on its anterior face; longitudinal diameter of eye slightly exceeding 
half interorbital width ; spiracle a short transverse slit, its length one-fifth the interval between spiracles ; 
mouth wide, little arched, the extreme width equaling preoral length of snout; fold at angle of mouth 
well developed and continued for a short distance along both jaws, its length from angle of mouth 
equaling to f preoral length of snout; upper teeth in 27 transverse rows, most of' the teeth functioning at 
the same time; each tooth with a central point and a pair of shorter lateral cusps; but one functional 
series of 29 teeth in mandible, forming an almost complete cutting edge, the single point of each tooth 
directed nearly horizontally away from the' middle line. 
Insertion of anterior dorsal spine midway between tip of snout and base of upper caudal lobe, and 
slightly nearer to second spine than to the line joining the spiracles;' length of the first spine nearly 
equal to base of fin; interspace between dorsals equals distance from tip of snout to spiracles. 
Skin thickly beset with small plates, which bear each a slender spine; along the back, and 
especially on the tail, these prickles are arranged in lengthwise series; fins largely smooth, with 
patches of prickles on their basal portions only; small areas immediately behind dorsal, pectoral, and 
ventral fins naked; lips and buccal groove, nostrils, spiracles, and eye naked, head otherwise uniformly 
covered. 
Color warm brown; lower side of head, breast, and abdomen purplish black; dorsals black on 
basal and anterior portions, broadly white otherwise; caudal lobes black, the intermediate portion 
light-margined ; pectorals and ventrals dusky with white posterior edges. 
Only the type known. 
Centroscyllium ruscosum, new species. Fig. 230. 
Type, 222 mm. long, from station 3997, vicinity of Kauai, depth 418 to 429 fathoms; type, No. 
51585, U. S. Nat. Mus. 
Length of head, exclusive of branchial area, 22 hundredths of total length; width of snout 12, 
slightly exceeding interorbital width; preoral length of snout 10, preocular length of snout 7; longitu- 
dinal diameter of eye 6.5; width of mouth 11; distance between spiracles 9; least distance between 
