Jordaji and Evermann. — Fishes of N'orth America. 2493 



Islands, in deep water. Only the type known, an example 4f inches \on^. 

 (Sspfia, skin; dermatinus, skinny.) 



Lycodapus dermatinus, Gilbert, Rept. IT. S. Fish Conim. 1893 (189G), 471, pi. :^5, Aleutian 

 Islands, lat. 37° 54' lo" N., long. 123° 30' W., at Albatross Station 3162, in 552 fathoms. 



2864. LYCODAPUS FIERASFEB, Gilbert. 



Head 5^; depth 10; eye U in head; .snout 3^; maxillary 2 to 2^. D. 82; 

 A. 70. Body compressed, elongate, tapering rather rapidly hackward, the 

 tail not produced to a filament; head flat above, the cheeks deep, vertical, 

 the mouth very oblique, with the lower jaw slightly the longer and nearly 

 entering the upper profile; skull very thin and papery, translucent; jaws 

 weak; gape of mouth wide, the maxillary reaching vertical from behind 

 front of pupil; teeth all small, in a very narrow band iu jaws, in a 

 single series on vomer and palatines; Interorbital width f of eye; snout 

 broad, depressed, spatulate, its tip prominent, turned upward, the upper 

 profile thus longitudinally concave; an evident median ridge on snout and 

 interorbital space; gill slits continued foi'ward below to vertical from 

 middle of eye, the membranes united for a distance equaling diameter of 

 pupil; gill rakers short, less than diameter of pupil, strongly toothed, 

 about 10 on horizontal limb of arch; head without conspicuous mucous 

 pores or cavities. Dorsal beginning well forward, its distance from occi- 

 put slightly less than that from occiput to nostril. Dorsal and anal rays 

 slender, all articulated, branched only at tips; caudal not distinct, the 

 rays springing from end of tail not projecting bej'ond the others; origin 

 of anal immediately behind vent, its distance from snout nearly equal- 

 ing I total length; pectorals narrow, varying in length, about 2\ in head. 

 Body and fins invested in a rather lax transparent skin, without traces 

 of scales. Color, body translucent, dusted with black specks; abdomen 

 blackish ; lips, inside of mouth, lining of gill cavity, and peritoneum jet- 

 1)lack; iris silvery. (Gilbert.) North Pacific. The types, several speci- 

 mens, the longest 5^ inches, from Albatross Stations 2980, 3010, 3072, off 

 Lower California, iu 610 to 1,00.5 fathoms. Also taken near Unalaska in 

 109 fathoms. {Fierasfer, the pearlfish.) 



Lycodapus fiera.ifer, Gilbert, Proc. U. S. Nat. Mu.s. 1890, 108, off Lower California, in 610 

 to 1,005 fathoms (OoU. Dr. Gilbert) ; Jordan, Proc. Cal. Ac. Sci. 1896, 234, pi. 23. 



286.5. LYCODAPUS PARVICEPS, Gilbert. 



Head 7f ; depth 11 ; eye ii in head ; snout 3^ ; least interorbital width 5 ; 

 maxillary 2i; pectoral 2f. D. 100; A. about 8.5 (both counted to middle 

 of caudal); P. 9; no veutrals. Upix-r profile of head nearly straight, not 

 longitudinally concave as in L. fierasfer; head deeper and narrower, the 

 snout less spatulate ; skin thicker. A conspicuous series of pores on man- 

 dible and along preopercular margin; gill slit very oblique, extending 

 anteriorly as far as vertical from eye, the membranes then narrowly united, 

 free from the isthmus except at extreme front; gill slit superiorly much 

 more restricted than in L. fierasfer, not extending above base of pectorals, 

 while in the latter it extends above them for f diameter of eye. Mouth 



