422 DEEP-SEA FISHES OF THE ATLANTIC BASIN. 



formed by the prefrontal and suborbital bones terminates very slightly behind the posterior 

 margin of the orbit, and is not connected with the angle of the preoperculum. 



Nostrils immediately in front of the lower part of the eye, not tubular, the anterior one 

 very small, pore-like, only about one-fourth as large as the posterior one. Distance of 

 anterior nostril from tip of snout about three-fourths length of eye. Length of barbel (51 

 millimeters) Of in length of body, and equal to length of head without snout (in the larger 

 specimen the barbel is as long as the mandible), more than 3 times as long as the eye. 



There are no true teeth, the iutertnaxillaries and mandible being broad plates, covered 

 with minute asperities. A naked space at the symphysis of the intermaxillaries. 



Distance of first dorsal from snout (77 millimeters) nearly 3J times length of its base; the 

 fin contains 2 spinous and 10 or 11 branched rays; the first spine is minute, the second (in 

 the types) somewhat mutilated, its length nearly 3 in length of head. 1 It is not stouter 

 than the branched rays, and is entirely smooth. 



The second dorsal is separated from the first by a very short interspace, equal to about 

 one third of the length of the eye. Its rays are long, subequal, the first slightly the 

 longest, its length equal to that of the base of tlio first dorsal. 



The anal is much lower than the dorsal, the longest rays being in front, its third ray 

 about half as long as the first ray of the second dorsal; this fin is inserted under the 

 seventh ray of the second dorsal. About three of the terminal rays might be considered 

 caudal rays. 



Pectoral inserted slightly in advance of the ventral, which is in about the same vertical 

 with the origin of the first dorsal. The second ray of the pectoral is slightly produced. 

 The length of the fin equal to that of the head without the snout. 



Ventral insertion distant from the tip of the snout a distance equal to that of first 

 dorsal from snout. The first and second rays are filamentous, the latter slightly the longer, 

 and extending to the fifteenth (or eighteenth in larger specimen) ray of the anal fin. 



Radial formula: D. II, 9-10 (135); A. (120); P. 25; V. 8. 



Color, brown; vertical fins, bluish or black; peritoneum, black; inside of gill covers 

 and roof of mouth, bluish. 



The type is a specimen, 325 millimeters in length, obtained by the Bit tie from station 

 LXXXix, off Martinique, at a depth of .ill fathoms. A much larger specimen, 580 millime- 

 ters in length, which is referred to as a collateral type, was taken by the Albatross from 

 station 2394, in 28° 3S' 30" K lat, 87° 02' W. Ion., at a depth of 420 fathoms. The Blake 

 also secured a single specimen from station lxxxviii, off Martinique, in 470 fathoms, 



UATHYGADUS LONGIFILIS, Goodk and Bean. 



Bathygadue lotigifilis, Goode and Bean, Proc. V. S. Nat. Mas., vm, 1885, 599. — GOnther, Challenger Report, 



xxn, 1887, 157.— Alcock, Ann. and Man. Nat. Hist., 1890, 302; 1891, 123. 

 Hymenocephalus longifilis, Vaillaxt, Exp. Sci. Travailleur et Talisman, 218, pi. xxm, fig. 1. 



The body is more compressed than in B. macrops. Its greatest height (•">! millimeters 

 in the largest specimen examined) contained 7£ times in total length. 



Scales small, cycloid, deciduous, about 142 in the lateral line, about 25 rows from the 

 vent upward and forward to the dorsal fin. 



Length of head (40 millimeters) contained about 5f times in total length. Interorbital 

 area flattened, its greatest width contained 3| times in the total length of the head. Post- 

 orbital portion of the head (20 millimeters) twice as long as the eye, which is oval, its long 

 diameter (10 millimeters) contained four times in the length of the head, and equal to length 

 of snout. 



Snout and nostrils normal. 



The maxilla reaches somewhat beyond the posterior margin of orbit, its length (21 mil- 

 limeters) twice in distance from snout to origin of first dorsal. Length of mandible (20 



'Judging from the larger specimen, this spine in a usual state would lie considerably longer. 



