101. ICOSTEIDiE — ICICHTHYS. 621 



(groups of spines). L. about 12 inches. Pacific coast of United States ; 

 three specimens known, from deep water. 



(Lockingtoii, Proc. U. S. Nat. Mus. ii, G:?, 1880.) 



333.— ICICDIT'IIYS Jordan & Gilbert. 

 (Jordan & Gilbert, Proc. U. S. Nat. Mns. 1880, :*,!):>: t.Yi)C Tcichthi/s lockinr/fotii J. & G.) 



Body elongate, not elevated, not compressed at the bases of the ver- 

 tical lins. Head moderate. Eyes lateral. Mouth terminal, little ob- 

 lique, with small, sharp teeth in one series, in the jaws only. Prcmax- 

 illaries not ]>rotractile. Gill-membranes separate, free from isthmus; 

 gill-rakers long. Pseudobrauchiie present. Branchiostegals 7. l>ody 

 covered with small cycloid scales. Lateral line continuous, unarmed. 

 Bases of fins without spinules; dorsal and anal fins long and low, com- 

 posed of soft rays only; pectoral fins moderate, their bases fleshy, as 

 in Icosteus; ventral fins small, thoracic, I, 5. Pyloric coeca about G, 

 large. Bones all very flexible, cartilaginous. Deep-sea fishes, {luoi^ 

 to yield or submit; izOh:;^ fish — in allusion to the flexible skeleton.) 



970. I. loeliaaas'lonai Jor. & Gilb. 



Plain brown, paler below, somewhat punctulate. Body oblong, some- 

 what compressed, the caudal peduncle rather slender. Head moderate, 

 compressed, with vertical cheeks, rather broad and slightly convex above, 

 the snout abruptly descending. Mouth moderate, little oblique, the slen- 

 der maxillary scarcely widened at the tip, extending to beyond front of 

 l)upil; anteiior edge of the premaxillary on the level of lower rim of 

 eye; lips thin; premaxillary tapering backward, not ibrming the whole 

 margin of the upper jaw; maxillary behind slipping entirely under the 

 membranous edge of the preorbital; preorbital rather wide, with one or 

 two series of rather large, thin, cycloid scales (other scales on head, if 

 any, now lost on the ty[)ical example); lower jaw prominent, projecting 

 in front, included at the sides. Teeth in jaws only, minute, shar]), closely 

 and evenly set, larger and less numerous than in Icosteus ienigmaUcus. 

 Eyes large, lateral, longer than snout, 4 in head. Cheeks rather wide; 

 preo])ercle with a prominent crest, behind which are some radiating mu- 

 cous (;avities; the bone with abroad, prolonged, fiexible, membranaceous 

 edge, covered with radiating strice, each of which ends in a flexible point. 

 Oj)ercle ami subopercle rather large, extremely thin, and each crossed 

 by radiating stria*. Branchiostegals 7. Gill-rakers long, sl.'nder, sharp, 

 close-set, and moderately still", their length nearly three-fourths tlie diam- 

 eter of the eye. Scales very small, soft, and smooth, covering the body 



