66 DEEP-SEA FISHES OP THE ATLANTIC BASIN. 



BATHYPTEROIS LONGIPES, GCntuek. (Figure 76.) 



liathypterois longipes, Gunthki:, Aim. and Mag. Nat. Hist., 1878, ii, 184; Challeiigor Report, xxii, 188, 

 ])l. xi.vni, fig. A. 



The uppenno.st ])ectoral ray is the strongest, alxmt as long as the wliohi tish, l)ifid 

 towards its extieniity. Outer ventral rays much proloirged, strong, but not dilated at the 

 extremity. Dorsal fin inserted at some distance behind the root of tlie ventrals. Adipose 

 fin present or absent. 



Similar to liathypterois longlfiUs, from which it differs only in the following points : Eye 

 minute. The dorsal tin is placed farther backwards, its origin being nearly midway betw'eeu 

 the end of the snout and the root of the caudal ; conseqinnitly the root of the ventral is some 

 distance in advance of the dorsal, and the end of the dorsal is vertically opposite to the 

 fifth anal ray. One specimen i)ossesses, the other lacks, adipose fin. ('aiidal fin deeply 

 forked, with the outer ray much produced. Of the two branches into which the posterior 

 third of the long pectoral ray is split, one is nuich shorter and weaker than the other. The 

 two outer ventral rays are closely adpressed from the root to the end, and much stouter and 

 longer than the other rays; they are articulated to the enil and without the soft pads 

 described in the preceding species. These fin rays extend beyond the end of the anal fin. 

 (Giinther.) 



Color black, with white fins. 



Radial formula: B. 12; D. 13; A. 10; I'. 2-7-8; V. 8; L. lat., 55; L. trausv. G | 8. 



The Challenger obtained two specimens, 9 inches long, from off the east coast of South 

 America, station 325; depth, 2,050 fathoms. 



A specimen (No. 35635, U. S. N. M.), 9 inches in length, and another siiecimen (No. 

 31804, TJ. S. N. M.), 3 inches in length, were obtained by the Albatross. 



A specimen, 2i inches long, was obtained by the Blake at station cxci, in 25° 83' N. lat., 

 84° 35' W. Ion., at a depth of 539 fiithoms. It is too small to be studied, but appears to 

 have only 12 rays in the dorsal. It is distinctively marked bj' a brown blotch on the base 

 of the caudal rays, above and below. 



Another was obtained by the Blake at Station CCXLVI, in 21° 36' N. lat., 81° 05' W. 

 Ion., at a depth of 955 fathoms. 



Family IPNOPID^E. 



Ipnopidw, Gill, Science, iii, 620, 1889 — (name only). 



Synodontoideans with a pair of frontal phosphorescent organs and the eyes entirely 

 aborted. (Gill.) 



IPNOPS, Gunther. 



Ipnops, GtyNTiiER, Ann. and Mag. Nat. Hist., 1878, 5th series, ii, 186. — Challenger Report xxii, 190. — Nature, 

 July 2, 1885, 205. 



Body elongate, subcyhndrical, covered with large, thin, deciduous .scales, and without 

 phosphorescent organs. Head depressed, with broad, long, spatulate snout, wliole upper 

 surface of which is occupied by a pair of large, transparent, lameUiform, membrane-bones 

 which cover a luminous organ longitixdinally divided into two synmietrical halves. Eye 

 absent. Nostrils reduced toaminute openingiu front (?) of each lamina. Bones of the head 

 weU ossified. Mouth wide, with the lower jaw projecting; maxillary dilated behind. Both 

 jaws with narrow bands of villiform teeth; palate toothless. Pectoral and ventral fins well 

 developed, and, owing to the shortness of the trunk, close together; adipose fin none. Anal 

 fln moderately long. Caudal snbtruncated. Pseudobranchiie none. Air bladder none. 

 Pyloric appendages none. {Giinther.) 



