34 DEEP SEA FISHES. 



Isistius brasiliensis. 



Sci/mnns brasilien.w Qiioy and Gaimard, 1824, Freycinet's Voyage, Zool., I., 198. 



Squnliis (Scymnus) fulgens F. D. Bennett, 1840, Narrative of a Whaling Voyage, II., 255; 



G. Bennett, ISGO, Gatherings, 66. 

 Scymnus (Scymnus) brasiliensis Miiller and Henle, 1841, Plagiost., 92, witli varieties S. torquatus 



and S. unicolor, both of which are credited to Valenciennes; Duin., 1865, Elasm., 453. 

 Dnlatias brasiliensis Gray, 1851, Chnndropt., 76. 

 Leius ferox Kner, 1865, Denkschr. Ak. Wien, XXIV. (for 1864, Nov. 10), Extr., p. 10, Plate 4, 



fig. 2, described and fignred. 

 Isistius brasiliensis Gill, 1865, Pr. Phil. Ac, 264 (for 1864, Nov. 22), name only; Giint., 1870, 



Cat., VIIL, 429, described; Pet., 1876, Sb. Brl. Akad., 853, locality. 



Plate I. fig. 1, Plate II., Ill, Plate LXIX. iig. 2. 



Body elongate, subcylindrical, tapering behind the middle, slender in the 

 caudal region, body cavity extending tlirough the anterior two thirds of 

 the total length. Head small, length to the hindmost gill opening less than 

 one fifth of the total, subconical, depressed to a very low arch or nearly flat 

 on the crown, wider than high. Snout short, blunt, rounded, hardly as long 

 as the orbit, little broader than deep. Nostrils, small, anterior, rather close 

 together. Mouth of medium size, inferior, slightly backward of a vertical 

 from the hind border of the orbit, transverse, with a deep groove in front of 

 the upper lip, and a deep fold behind each angle reaching more than half 

 way to the first gill opening. Upper lip distinct, separate from the lower ; 

 lower labial folds lateral, short, narrow, rounded, at the angle of the mouth, 

 attached to the labial cartilages, not extending toward the symphysis on the 

 lower jaws. Upper teeth small, raptorial, oblique, acuminate, movable, in 

 thirty-three longitudinal rows, several of the transverse series in function 

 at the same time, Plate II., fig. 8 ; lower teeth large, sectorial, erect, fixed, 

 broad, thin, sharp angled on the middle of the cusp, smooth on the cutting 

 edges, decreasing in size from the median to the outer tooth, which is 

 shortest and broader, interlocking on the edges so as to form a continuous 

 saw-like plate of thirty-one teeth, all of which are in function at once, Plate 

 II., fig. 9. The number of teeth noted by Giinther (25) and that by Kner 

 (26) were taken from young individuals. Eye large, nearly one sixth of the 

 length to the hindmost gill aperture; pupil round; orbit longer than high, 

 not angled in front, with an angle on the hind border where the upper edge 

 overlaps the lower; no nictitating membrane. Spiracles moderately large, 

 superior, nearly transverse, Plate II., fig. 1. Gill openings five, narrow, 



