146 DEEP-SEA FISHES OF THE ATLANTIC BASIN. 



examination of their skeletons. The species combined under the name Murwnesox are the 

 only ones known to be certainly possessed of the characters provisionally assigned to the 

 tamily." {GUI.) 



This family may provisionally receive, in addition to its typical form, a number of 

 genera, cliietly American. They occur chiefly in warm regions. Only three genera are as 

 yet known from the deeper waters, Xennmysta.r, lloplunnis^ and fSatiromunmesox. 



XENOMYSTAX, Gilbert. 



Xcnomystax, Gilbert, with Jord^vn & Davis, Rep. U. S. F. C, 1888 (1891), 648. 



Teeth all conical, slender, and sharp, those of jaws in wide bands; maxillary with 

 deep groove, running the entu-e length of the bone and di\iding the band of teeth into two 

 portions ; shaft of vomer with a medial series of conical teeth. 



The genus is represented by a single species, X. atrarius, Gilbert (loe. cit), from 401 fath- 

 oms off the west coast of Ecuador. 



HOPLUNNIS, Kaup. 



Eophuinis, Kaup, Aale Hamburg. Museum, 1859, 19 (type H. 6'c/imirf/is).— Guntuer, Cat. Fish. Brit. Mus., 

 VIII, 1870, 49. — Jordan & Davis, loc. cit., 643. 



Murffiuesocids, with scaleless body, with tail about four times as long as trunk. Snout 

 moderately produced. Teeth eight, biserial aud small on jaws. Vomerines with a single 

 series of long-pointed teeth. Dorsal and anal well developed, the origin of the former above 

 the gill opening. Gill opening small. Posterior nostril in front of eyes. 



HOPLUNNIS DIOMEDIANUS, Goode and Bean, u. s. (Figure 163.) 



A Mophinnis related to H. Schmidti, with height of body one-quarter length of head ; 

 its width two-thirds of its height. Snout thi-ee to three and two-thirds times eye. Cleft of 

 mouth extends slightly beyond hind margin of eye. Teeth in jaws small, pointed, in narrow 

 bands, the inner series of the lower jaw consisting of enlarged, widely separated canines. 

 A pair of larger canines near the end of the lower jaw in the example figured. A row of 

 six to eight strong, large canines ou the vomer, 



A single individual (No. 44240 U. S. Nat. Mus.) was obtained by the Albatross at sta- 

 tion 2402, 111 fathoms, lat. 28° 36', long. 86° 50'. 



SAUROMUR^^NESOX, Alcoek. 



Sauromurceneaox, Alcock, Ann. and Mag. Nat. Hist., Nov. and Dec, 1889, 457. 



Form of the body widely departing from the tyiiical, the trunk being high and well 

 mai-ked off from the head and tail, which is a long, tapering appendage. Tissues well devel- 

 oped. Gills foiu-, opening into the pharynx by wide sUts; gill openings separate. Heart 

 situated immediately behind the gills. Nostrils lateral. Eye large. Tongne fi'ee. Verti- 

 cal fins ill developed, confluent; the dorsal begins in li-ont of the level of the gill opening. 

 Pectoral fins well developed. No scales. Snout long, pointed. Cleft of mouth extending 

 fiir behind the eye; the upper jaw overlapping the lowei\ One complete row of teeth in 

 each jaw and a second incomplete row in the maxilla ; premaxillary teeth and those at the 

 mandibidarly symphysis fanghke; a single row of large fangs in the vomer. 



This genus is represented by one species, S. vorax, Alcock, from Bay of Bengal, taken 

 at the depth of 193 fathoms. 



Family OPHICHTHYID./E. 



OpMchthyida, Gli.L, Standard Natural History, in, 1885, 107. 



Ophhurida:, Kaup, Cat. Apod., 1856, i.— Jordan & Davis, Eep. U. S. F. C, 1888 (1891), 612. 



Ophichthyoid, apodal fishes, with gill openings rather wide, lateral; scaleless body, and 

 tip of tail sometimes free from vertical tins (sometimes with filamentous caudal fin). Pec- 



