2568 Bidlctin //, United States National Miiseiwi. 



2942. STEI\DACHNEBIA ARGENTEA, Gocde & Bean. 



Head 5\ in total ; depth 1^, at anal origin 8 ; eye 3| in head ; snout about 

 5i; interorbital widtli 5i ; maxillary 2; premaxillary 2; mandible If; gill 

 rakers 4 or 5 + 19; D. YIII, 123 + ; A. 10 + 113; P. 15; V. 8. Head and 

 body compressed; tail tapering to a very fine point. Scales small, decid- 

 uous, cycloid, 6 roAvs between lateral line and origin of soft dorsal. Nos- 

 trils nearer eye than end of snout, tlie anterior nostril nearly circular, the 

 posterior much longer and slightly concave; no barbel. Maxillary dilated 

 at the extremity and somewhat produced downward into an obtuse point, 

 reaching nearly to a vertical at posterior margin of orbit, and concealed 

 by the preorbital ; premaxillaries slightly protractile, much attenuated 

 posteriorly; mandible reacliing sliglitly behind eye. Premaxillary and 

 mandibular teeth biserial, those of the outer series enlarged and rather 

 widely set, some of the enlarged teeth slightly sagittate at tip; Aomeriue 

 teeth well developed; upper pharyngeal teeth in 2 broad, well-developed 

 patches. Gill rakers slender, the longest about 2 in eye. Distance from 

 snout to lirst dorsal about ,' total length, the lirst spine elongate, tiliform, 

 and reaching fourteenth ray of second dorsal; base of lirst dorsal about 1 

 in head; longest ray of second dorsal about 2.} in head, the rays diminish- 

 ing in size rapidly, the last minute; origin of anal under sixth ray of 

 second dorsal, not far behind the vent, the anterior elevated portion con- 

 sisting of 10 rays, all of which except the lirst are divided, the second ray 

 longest, twice length of eye, the tenth ray only about \ length of second, 

 and separated by a small membrane from rest oi hn which consists of very 

 minute rays. Vent under fourth ray of second dorsal. Origin of veutrals 

 un<ler base of pectorals and about under third spine of first dorsal; lirst 

 ventral ray filamentous, reaching origin of anal; pectoral reaching to below 

 fifteenth ray of second dorsal. Gulf of Mexico. Only the type known. 

 Length 233 mm. (ar<;en^e«8, silvery.) 



fiteindachneria argentea, Goode & Bean, Oceauic Ichthyology, 419, tig. 351, 1896, off delta 

 of Mississispi River, Lat. 39^ I4'30"N., Long. SS'^og' 30" 'W., in 68 fathoms. (Type, 

 No. 37350. Coll. Albatross.) 



997. TRACHYRINCUS, Giorua. 



Trachyrincus, GiORNA, Mem. Accad. Imp. Turin, xvi, 1803, 178 (no type mentioned). 

 Lepidolepriis, Risso, Ichth. Nice, 197, 1810 {trachyrinnis). 

 Oxycephas, Rafinesque, Caratteri, 31, 1810 {scabrus^ trachyrincvs) . 

 Lepidosoma, Swainson, Nat. Hist. Class'n Fish., 11, 261, 1839 {trachyrhynchus). 

 Trachyrhynchus, GtJNTHER, Challenger Report, xxn, 152, 1887 ; corrected spelling. 



Snout produced in a long depressed process which is sharply pointed in 

 front, with a sharp lateral edge, which is continued in a straight line 

 ;. cross the suborbital region. Mouth inferior, horseshoe-shaped, placed 

 like the mouth of a sturgeon. Teeth in both jaws in villiform bands; 

 chin with a l)arbel; a scaleless fossa on each side of nape. Second dorsal 

 well developed. Scales moderate, spinigerous; a series of larger scales, 

 each armed with a projecting ridge, along each side of base of dorsal and 

 anal anteriorly. Opercle small. Gill membranes scarcely uuited; gills 4; 

 first gill arch free, with short, sty li form gill r.akers. Deep seas. This 



