530 Bulletin 4y, United States National Museum. 



than that of head ; aual feeble. Several specimens were obtaiuecl by 

 the Alhalros'^ at about 40° N. latitude, 70° W. longitude, at a depth of 

 400 to 1.356 fathoms. (Goode & Bean.) (£i'pvr, wide; ui/', eye.) 



Bathijlaijiis cHn/ojw, (iooDE & Bean, Oceanic Ichthyology, 55, fig. G3, 1895, Gulf Stream. (Type, 

 No. 35420, Coll. Albatross; aud No. 318«1, Coll. Fish Hawk.) 



804. BATHYLAGl'S PACIFIC'US, Gilbert. 



Head 4 ; depth 6| ; eye 2i. D. 8 or 9 ; A. 16 ; P. 9 ; scales 40. Anterior 

 profile not decurved: premaxillaries anteriorly on level of middle of eye; 

 snout short, less than half eye; interorbital space narrow, deepl;s grooved, 

 i orbit ; lower jaw with a series of small teeth ; the very weak premax- 

 illaries toothless ; a strong series of teeth on vomer and palatines. Front 

 of dorsal midway between adipose fin and front of snout ; ventrals under 

 posterior part of dorsal ; anal far back ; tail as long as head. Scales 

 lost, apparently about 40 in lateral line. Head, lining of mouth, gill 

 cavity, aud peritoneum black ; fins blackish ; whole body probably black 

 in life. Coast of Washington ; two specimens taken in 685 aud 877 

 fathoms. 



Bathiilaf/us pacijiciis, Gilbert, Proc. U. S. Nat. Mus., 1890, 55, Albatross Stations 3071 and 

 3074. (Coll. Gilbert.) 



Order T. INIOMI.* 

 (The Lantern Fishes.) 



Soft-rayed fishes, with the anterior vertebrae simple, unmodified, and 

 without auditory ossicles; symplectic present; no interclavicles; opercu- 

 lar apparatus sometimes incomplete ; pharyngeal boues unmodified ; gill 

 openings ample. Mesocoracoid arch wanting or atrophied.! Bones of 

 jaws variously developed, the maxillary sometimes connate with the pre- 

 maxillary. Shoulder girdle with its post-temporal not normally con- 

 nected with the skull, but touching it at or near the nape. Gills 4, a 

 slit behind the fourth. Air bladder, if present, with a duct. Dorsal and 

 anal fins without true spines ; ventral fins, if present, abdominal ; scales 

 mostly cycloid, often wanting; adipose fin present or absent. Skeleton 

 mostly very weakly ossified. Photophores present in most cases. 



Marine fishes, mostly inhabiting the oceanic abysses, closely allied to 

 the Iso)H)ondijIi, but lacking the mesocoracoid and having the connection 

 of the shoulder girdle with the cranium imperfect. In the character of 

 the mesocoracoid these fishes agree with the eels, and with the Haplomi 

 and the spiny-rayed fishes. These latter have the post-temporal differ- 

 ently attached. This order is a provisional one, and its members may be 



* We have had no opportunity for critical study of most of the families of the Iniomi. Our 

 knowledge of them is drawn chiefly from the recent monographic works, especially the excellent 

 report of Dr. Giiuther on the Deep-Sea Fishes of the Challenger Expedition, that of Dr. V.aillant 

 on the fishes taken by the Travailleur et Talisman, and that of Dr. Tjiitken on the "Spolia 

 Atlantica" in the museum at ('openhagen. Even more important tluin these has been the 

 Oceanic Ichthyology of (ioode & Bean, advance sheets of which comprehensive work have been 

 mo.st kindly placed at our disposal. 



fThis character, the most important by which the Iiiiuiiii arc separated from Iso^pondyli, has 

 not been verified in several of the families. 



