101, ICOSTEIDJS — ICICHTHYS. 621 
(groups of spines). L, about 12 inches. Pacific coast of United States ; 
three specimens known, from deep water. 
(Lockington, Proc. U. S. Nat. Miis. ii, 63, 1880.) 
333« — ICICHTHYS Jordau Gilbert. 
(Jordan & Gilbert, Proc. U. S. Nat. Mas. 1880, 305: type Mchtlnjs JocMngtoni J. & G.) 
Body elongate, not elevated, not compressed at the bases of the ver- 
tical fins. Head moderate. Eyes lateral. Mouth terminal, little ob- 
lique, with small, sharp teeth in one series, in the jaws only. Premax- 
illaries not protractile. Gill-membranes separate, free from isthmus; 
gill-rakers long. Pseiidobranchi® present. Branchiostegals 7. Body 
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, (^tzw, 
to yield or submit; fish — in allusion to the flexible skeleton.) 
DIO. I. lock.iaas'tOBii 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 
pupil; anterior edge of the premaxillary on the level of lower rim of 
eye; lips thin; premaxillary tapering backward, not forming 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 typical example); lower jaw prominent, projecting 
ill front, included at the sides. Teeth in jaws only, minute, shar]i, closely 
and evenly set, larger and less numerous than in Icosteus (Knigmaticiis. 
Eyes large, lateral, longer than snout, 4 iii head. Cheeks rather wide; 
preopercle with a prominent crest, behind which are some radiating mu- 
cous cavities ; the bone with a broad, prolonged, flexible, membranaceous 
edge, covered with radiating striie, each of which ends in a flexible point. 
Opercle and subopercle rather large, extremely thin, and each cro.ssed 
by radiating strife. Branchiostegals 7. Gill-rakers long, slender, sharp, 
close-set, and moderately stiff, their length nearly three-fourths the diam- 
eter of the eye. Scales verj- small, soft, and smooth, covering the body 
