580 BrLLKTIN OF THE UNITED STATES FISH COMMISSION. 



]>i)i-.-ial liiis lit c'i|ual leiiyth ami hei^jlit, srparatr.l hy an inti-rval l.i) times their length at base, 

 which equals half the wiilth of the mouth; anterior dorsal inserted largely above base ot ventrals, not 

 more than one-tourtli its base being behind them; second dorsal originating al.iove middle of anal tin 

 and tenninating slightly in advance of it,« end; base of anal tin I'.o times that of second dorsal, and 4 

 times its distan<'e from liase of ventrals; pectoral with a long base, the length of which equals its dis- 

 tance from base of ventral ; ]iect(.>ral short, rounded, its tip scarcely reaching half way to base of ventrals. 



Skin densely covereii with minute slender spines, wliich bear no cusps at their bases: margins of 

 tins and an area behind each of them naked. 



Color uniform warm brown. 



Only the Ivpe is knipwn, an a<lnlt female i-oiilaining a mature egg in each oviduct. 



Family SOLALlD.i:. 

 Squalus mitsukurii .Ionian A Snyder. 

 Station 40S.'i, ncjith coast of Maui, 2H7 to li.s:-! fathoms. 



Etmopterus villosus, new sjiecics. I'late Hfi. 



Type, 170 mm. long, from station :^824, off the south coast of Molokai. depth 222 to 498 fathoms; 

 type. No. 51,58:;, V. S. Nat. Mus. 



Length of hcail t(p first gill-cleft 22.5 hundredths of total length; interorbital width S; preoral 

 length of snout 11; preocular length of snout 8; least distance between nostrils 4; longitudinal 

 diameter of orliit 7; distance between spiracles 7.5; width of mouth 11; distance from tiji of snnut to 

 first dorsal spine .".S; length of first dorsal spine 5; base of lirst ilorsal H; space between dorsals Hi; 

 length of second dorsal sjiiiie S; base of second dorsal li; length of upper caudal lobe 24; length of 

 l)ect.oral 10. 



Lateral margins of snout nearly parallel, the terminal |iortion very abruptly and l>lunlly rrjimded; 

 width of snout e(iual to that of interorbital space; anterior nasal Hap narrow and pointed, the posterior 

 widened horizontally and concave on its anterior face; longitudinal diameter of eye .slightly exceeding 

 half interorbital v'uUh ; spiracle a shiu't transverse slit, its length one-tiftli the interval between spiracles; 

 mouth wide, little archeil, the extreme Avidth equaling jireoral length of snout: fold at angle of mouth 

 well developeil and contimied for a short distance along both jaws, its length from angle of mouth 

 equaling to i preoral length of snout; uppier teeth in 27 transver.-e rows, most of the teeth functioning at 

 the same time; each tooth with a i-entral 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 midw-ay l)etween tip of snout and base of upper caudal lobe, and 

 slightly nearer to second spine than to the line joining tlie siiiracles; length of the first spine nearly 

 equal to base of fin; interspace betw^een dor.sals eipials distance from tip of snout to spiracles. 



Skin thickly beset with small plates, which bear each a slender siiine; along the back, ami 

 especially on the tail, these prickles are arranged in lengthwise series; fins largely smooth, with 

 patches of prickles on tlu-ir b;i.-^al portions only; small areas immediately behind dorsal, pectoral, and 

 ventral fins naked; lips and buc'cal groove, nostrils, spiracles, and eye naked, head otherwise miiforml\ 

 covered. 



Color warm biciwii; Icjwer side of head, breast, and abdomen ])ur|ilish lilack; dorsals black on 

 basal and anterior, [lortions, broadly white otherwise; cau<lal lobes black, the intermediate jiortiiin 

 light-margined; |iectorals and ventrals dusky with white posterior edges. 



Only the type known. 



Centroscyllium ruscosum, new species. Fig. '2H0. 



Type, 222 mm. long, from station :W97, vicinity of Kauai, dejith 418 to 429 fathoms; type. No. 

 51585, U. S. Nat. Mus. 



Length (jf head, exclusive of branchial area, 22 hundredths of total length; width of snout 12, 

 slightly exireeding interorbital width; jireoral length of snout 10, ]u'eoi'ular length of snout 7; longitu- 

 dinal diameter of eyetj.o; width of mouth H; distance bi-l\si>cn spiracles 9; least distance between 



