NO. 1263. JAPANESE TRACHINOID FISHES— JORDAN AND SNYDER. 47^ 
8. ARISCOPUS Jordan and Snyder, new genus. 
Ari.%-opus Jordan and Snyder, new genus {ibiiriu.'i). 
This genus is close to Gnat/ifu/n ^/y, from which it differs in the absence 
of scales. Minor characters are the stouter form, the absence of a 
sharp point on the saber-like dilatation of the lower jaw, and in the 
presence of a blunt prominence on the angle of the preopercle. 
{api. an intensive particle: ffKono^, gazer.) 
15. ARISCOPUS IBURIUS Jordan and Snyder, new species. 
Head 2| in length; depth 3f ; depth of caudal peduncle 3i in head; 
ove 4^; snout 6|; interorbital space 2i; D. 12; A. IT; P. 22. 
Body robust, slightly deeper than head, the caudal peduncle deep, 
compressed; head broader than body, flat above, the sides vertical. 
Eyes large, the diameter greater than length of snout, placed high 
up. directed obliquely; interorbital space slightly concave, the width 
of depression in occipital plate equal to diameter of eye, its posterior 
edge on a horizontal between pupil and posterior edge of orbit. 
Fk;. J.— ARISCOPUS IBITRIL'S. 
]\routh vertical, maxillary contained 2 times in head, extending pos- 
teriorly to a vertical through pupil, the upper edge sliding beneath 
the preorbital; the lips without fringes; teeth simple, sharp, depress- 
ible, those on the upper jaw in a narrow band, on the lower jaw in 2 
rows anteriorly, a single row posteriorly; villiforni teeth on vomer 
and pharyngeals. Gill-rakers represented by a few small elevations, 
the pseudobranchia? prominent. 
Body naked; lateral line running along upper part of body, gradu- 
ally approaching the dorsal median line until the base of last dorsal 
ray is reached, where it abruptly bends doAvnward to middle of base of 
caudal fin; head with plates on the top, their surfaces rugose or with 
radiating lines and sides; those on the top without any interspaces, 
fused together into one large plate, extending forward to anterior 
edges of orbits, the posterior edge straight; a row of narrow, rough 
plates extending from eye to upper edge of gill-opening, where it ends 
in a flat humeral spine; suborbital and preorl)ital plates prominent, 
preopercle with radiating ridges, the angle with a l»lunt prominence; 
