2592 Bulletin 47, United States National Museum. 



including maxillary, 3 in head ; mandible 2 in depth of body ; barbel 2 to 

 1\ in eye. Gill rakers very small, tubular, almost rudimentary, about 10 

 below angle of first arch ; attachment of membrane to first arch very 

 extensive, but free from isthmus ; no pseudobranchise. First dorsal com- 

 paratively low, the first spine rudimentary, the second elongate and 

 smooth; insertion of first dorsal immediately over or somewhat behind 

 base of pectoral, its distance from snout \\ in head, its base equal to 

 snout, its longest spine, when laid down, reaching behind origin of second 

 dorsal, or 1 to 2 in head; second dorsal very low, its distance from iirst 

 3 to 4 in head, 32 rays in a distance equal to length of head ; 22 in same dis- 

 tance of anal; anal much higher than second dorsal, yet very low, its 

 longest ray equal to eye ; distance of anal origin from snout 4f in total 

 length, or nearly under origin of second dorsal; pectoral inserted under 

 or somewhat in front of origin of first dorsal, its length about 2 in head; 

 ventral inserted behind vertical from end of base of first dorsal, extend- 

 ing to origin of anal, its length about equaling eye ; vent about midway 

 between origin of ventrals and anal. Color brown ; abdomen and lower 

 parts of head blackish in the young. West Indies and Gulf of Mexico, in 

 deep water; taken both by the Albatross and the Blake, (sulcatus, fur- 

 rowed.) 



Coryphcenoides sulcatut, GOODE <fc BEAN, Proc. U. S. Kat. Mus. 1885, 596, Gulf of Mexico, 

 at Albatross Station 2394, Lat. 28 38' 30" N., Long. 87 02' W., in 420 fathoms 

 (Type, No. 37335) ; GOODE & BEAN, Oceanic Ichthyology, 403, 1896. 



Macrurus (Malacocephalus) sulcatus, GUNTHER, Challenger Report, Deep-Sea Fishes, xxn, 

 169, 1887. 



Trachonunu sulcatut, GOODE & BEAN, Oceanic Ichthyology, 410, fig. 343, 1896. 



1009. LIONURUS, Giinther. 



Lionurus, GtfNTHER, Challenger Report, xxn, Deep-Sea FisheB, 124, 1887 (filicauda). 



This genus is close to Macrourus, differing in the smooth, flaccid scales, 

 and soft, cavernous skull, characters associated with its extreme bathybial 

 degradation. (XElos, smooth; ovpd, tail.) 



a. Barbel minnte, not } pupil; eye small, 5 in head; tail very slender. 



FILICAUDA, 2969. 



aa. Barbel moderate, If in eye; eye 3| in head. LIOLEPIS, 2970. 



2969. LIONUBUS FILICATTDA (Giinther). 



D. 11; P. 20; V.9; caeca 7. Snout considerably projecting beyond the 

 mouth, pointed in the middle, twice as long as eye, which is unusually 

 small, only as wide as interorbital space. Mouth rather wide, extend- 

 ing beyond the center of the eye. Upper teeth villiform, in a very nar- 

 row band, those of mandible very small, biserial. Barbel minute. Pre- 

 operculum with the angle produced backward, broadly rounded and 

 crenulated on the margin. Terminal portion of the tail prolonged into a 

 long filament, more slender than in any of the other species. Bones of 

 head soft. Scales of moderate size, thin, cycloid, and deciduous, 6 or 7 in 

 a transverse series between the first dorsal spine and the lateral line ; snout 



