242 MEMOIRS OF THE CARNEGIE MUSEUM. 
midway between tip of snout and eye, closely apposed, anteriorly with slight rim; 
jaws equal; teeth of moderate size in both jaws, in a single row posteriorly, two 
rows present anteriorly, the inner some distance behind the outer; vomer with two 
somewhat large teeth; palatines with single row of small teeth; those in jaws slightly 
enlarged in outer row, especially anteriorly; gill-rakers short and blunt, about 
eleven on lower limb of first arch. 
Dorsal inserted above pre-opercular margin and extending to within half an 
eye-diameter from base of caudal, its longest rays half length of head, but slightly 
lower in any portion of fin; anal inserted midway between base of caudal and center 
of eye, its longest rays about as long as snout, its base extending as far posteriorly 
as dorsal; pectoral 1.66 in head; ventrals 1.33 in head, inserted under pectoral 
base; caudal deeply forked. 
Seales minute, imbedded, not imbricate; lateral line anteriorly sharply arched, 
apex of curve angular. 
Color in aleohol dark brown; dorsal, anal, and ventral fins darker, nearly 
black; pectorals colorless; anal dusky, save for tips of lobes, which are clear. 
Although allied to Centrolophus, the color and texture of Ectenias shows it to 
be a shore-fish. 
Family ICOSTEID®. 
117. Icticus ischanus gen. et. sp. nov. (Plate X XVII, fig. 4.) 
Type No. 6036a, from Okinawa. 
The new genus [cticus seems related to Icichthys. 
Body oblong, compressed, the tissues soft; lateral line present; inner ventral 
ray adnate to belly on either side of groove, which begins at ventrals and ends at 
the anus; body scaled; scales eycloid, small; teeth in a single series in each jaw, 
some on vomer and palatines. Fine loose teeth on upper pharyngeals; six branchio- 
stegals; gill-openings wide, the membranes free from isthmus; four gills, a slit 
behind the fourth; pseudobranchiz large; air-bladder present, small; dorsal long, 
divided into two separate fins, free from caudal; ventrals below pectoral base; 
body oblong, compressed; the skeleton soft and flexible, the whole structure soft as 
in [costeus and Icichthys. 
The type of [cticus ischanus, described here, is a specimen two hundred and 
forty-five millimeters in total length, coming from Okinawa, Riu-kiu Islands, 
No. 6036a Carnegie Museum Cat. of Fishes. 
Head 3.4 in length to base of caudal; depth 4.166; eye 4 in head; maxillary 
3.33; snout 3; pectoral 1.75; ventral 2.5; D. XII-30; A. 30; P. 19; scales in lateral 
line 125 (approximate); ten scales between insertion of first dorsal and lateral line. 
