878 Bulletin 47, United States National Museum. 



dd. Lateral line obsolete or nearly so; finlets 2; skin with bony tubercles. 



RUVETTUS, 397. 

 cc. Dorsal and anal each without finlets; lateral line present, double. 



EPINNULA, 398. 

 bb. Ventral fins each reduced to a single spine. 



e. Dorsal fin more or less separated from soft part of the fin; body not greatly elon- 

 gate; finlets few or none. 



/. Space between vent and anal fin armed with a dagger-shaped spine; lateral 



line present, single; 2 or 3 finlets present. NEAI.OTUS, 399. 



ff. Space between vent and anal without dagger-shaped spine; finlets 2; lateral 



line single; ventrals minute; (young without finlets and with the ventral 



spines very long and jagged). PBOMETHICHTHYS, 400. 



GBHPTLIKJB: 



aa. Body greatly elongate, the dorsal fin with about 30 spines, the spinous part continuous 

 with the soft part; dorsal and anal finlets 6; dentition strong; ventrals I, 5, very small. 



GEMPYLUS, 401. 



396. BIPINNULA, Jordan & Evermann. 



Bipinnnla, JORDAN & EVERMANN, new genus, (violacea). 



Body subfusiform, elongate, low, uniform, slender ; head compressed ; 

 lower jaw longest, both jaws with small teeth ; teeth on vomer fang like. 

 First dorsal low, uniform, of 20 slender spines, the fin near soft dorsal, 

 the anterior lobe of which is moderately developed; finlets 2, anal spines 

 3, a dagger-shaped spine before it. Ventrals moderate, I, 5; pectorals 

 inserted low. Scales thin, cycloid, deciduous ; lateral line single. No 

 gill rakers. One species known. Dr. Gill divides the genus Thyrsites, 

 Cuvier & Valenciennes, into TJiyrsites* with 6 or 7 finlets, the lateral line 

 abruptly decurved, and Thyrsitops,^ with 4 or 5 finlets, and the lateral 

 line nearly straight. The American species, violacea, with 2 finlets, and 

 the lateral line lightly curved is still better distinguished, and should 

 probably constitute the type of a new genus, for which we propose the 

 name Bipinnula. (Ms, two ; pinnula, finlet.) 



1267. BIPINNULA YIOLACEA (Bean). 



Head 4 ; depth 8. D. XX-I, 19 + II j A. 17 + III ; V. I, 5 ; P. 13. 

 Width of interorbital area slightly greater than length of eye, which is 

 contained nearly 7i times in length of head and 3^ times in length of 

 upper jaw. Least height of tail equals width of interorbital area. 

 Length of snout twice that of longest dorsal spine, and i distance from 

 snout to origin of spinous dorsal. Maxilla extending to vertical through 

 front of eye. Length of upper jaw equals 3 times width of iaterorbital 

 space. Mandible reaches to vertical through hind margin of eye ; its 

 length, including the fleshy tip, is 5 times width of interorbital area. 

 Anterior nostril smaller than posterior ; situated in advance of eye 1 

 diameter of eye. Posterior nostril a narrow slit placed midway between 

 anterior and eye. Strong teeth on intermaxillary and mandible. Three 

 large fangs anteriorly in roof of mouth ; pseudobranchise well developed ; 

 no trace of gill rakers. Spinous dorsal begins at a distance from snout 



*Tkyrsitt*, CUVIER & VALENCIENNES, Hist. Nat. Poiss., vin, 196, 1831, (aiuri). (Thyrsites, an 

 old name of some fish, from Qvpcros, a wand.) 

 t Thyrsitops, GILL, Proc. Ac. Nat. Sci. Phila., 1862, 125, (lepidopoidet). 



