Nu.iiu. PROCEEDINGS OF THE NATIONAL MUSEUM. 429 



sih^ery or blackish silvery. The typical deep-sea cliaracters are very 

 marked. 



Ninety-one specimens, 3^^ to 7 inches long, from stations 34G7, 3470, 

 3471, and 3470; 310, 343, 337, and 298 fathoms respectively. 



Type.— 1^0. 47735, U.S.N.M. 



TRACHONURUS SENTIPELLIS, new species. 

 (Plate XLV, fig. 1.) 



Head about 6i; depth about 8. First dorsal I, 8; pectorals 10 to 17; 

 veutrals 7; second dorsal low; anal rays well developed. 



Head compressed, squarish, the sides vertical. Snout short, obtusely 

 conical, overhanging the mouth but little, without tubercles, a little 

 shorter than orbit. Interorbital space flat, a little greater than diame- 

 ter of orbit. Orbit moderate, nearly circular, 3f in head. Mouth lateral, 

 entirely below lower rim of orbit, maxillary reaching a little beyond mid- 

 dle of orbit. Teeth in villitbrm bands in both jaws; the outer series of 

 the upper jaw slightly enlarged. Barbel small, about 2| in orbit. Gill 

 membranes united with a broad free fold behind. Anterior gill slit 

 short, about 2^ in orbit. Scales firmly embedded, but distinct, imbri- 

 cated, rather small; 8 scales in a transverse row between the lateral 

 line and origin of first dorsal. Scales from the side above the lateral 

 line with 10 to 11 long, strong spinelets frequently arranged in 3 radiat- 

 ing series; others from back behind origin of second dorsal and from 

 side near origin of anal with about 8 spinelets similarly arranged; one 

 from far back on tail with 9 spinelets in 5 series; others from the back 

 in front of the first dorsal with 8 to 10 spinelets irregularly arranged. 

 Spines on head and anterior i^art of body short and suberect; poste- 

 riorly becoming long, very slender, and closely appressed. Series of 

 scales along the base of anal enlarged, each scale bearing a single 

 oblique row of spines larger than those elsewhere on body. Posteriorly 

 on tail and at extreme anterior end of anal these enlarged scales merge 

 into the ordinary scales of the respective regions. Scales along base 

 of dorsal not enlarged, .some of them showing, however, a single oblique 

 series of slightly enlarged spinelets. The whole head, except lips and 

 gular and branchiostegal membranes, completely scaled. Second dorsal 

 spine smooth, slender, 1| in head. Base of first dorsal a little more 

 than half as long as orbit. Distance between dorsals about twice the 

 base of the first dorsal. Pectorals narrow, about 2^ in head. Ventral 

 rays reaching about to origin of anal, the outer ray but little prolonged. 

 Space between base of ventrals and origin of anal naked. Vent nearer 

 the latter. Distance between base of ventrals and origin of anal two- 

 sevenths of length of head. Origin of anal under middle of interspace 

 between dorsals. 



Color {in alcohol). — Dark brownish, darker anteriorly. Lips, mouth, 

 and gill cavities, lining of esophagus and the belly, bluish black. Fins 

 dusky, veutrals blackish. Peritoneum black. 



