NO. 1200. THE SURF-FISHES OF JAPAN— JORDAN AND SINDO. 355 
NEODITREMA Steindaehner. 
Neoditrema Steindachner, Beitr. Kenntn. Fische Japans, II, 1883, p. 32 {r-an- 
sonneti). 
Bod}' elongate, compressed, with rather long- caudal peduncle; fron- 
tal region depressed above e^'es. Mouth small, the lower jaw pro- 
jecting; dentition unlike in the two sexes; females without teeth in 
the jaws; males with one row of l^luntish teeth above, these wide set 
and turned forward in a line with direction of edge of premaxillary 
bone, the lateral teeth largest; lower lip thin, without frenum; gill 
rakers close set, long and slender, about 25 below angle of arch; lower 
pharyngeals small, with small teeth; scales small, deciduous, about 70 
in the lateral line; dorsal fin low^, rather short; anal low, rather short, 
luuch distorted in the male; alidomen shorter than anal fin. 
One species known, a small fish closely allied to the American genus, 
JIi/j)ocritichthj/s, from which it diifers in the dentition. From Ditrema^ 
both genera are separated b}' the long and slender gill rakers, the 
depressed frontal region, and the free lower lip. 
{vaoz^ new; Ditrema.) 
NEODITREMA RANSONNETI Steindachner. 
NE, OKITANAGO (OFFSHORE SURF-FISH). 
iV<?odi<remff rf(nson)je<i Steindachner, Fische Japan.s, II, 1883, p. 32; Yokohama. — 
Jordan and Snyder, Proc. U. S. Nat. Mus., 1901, p. 752; Tsushima Island, 
Straits of Korea. 
Head, U to 3f in length; depth, 3 to 3^. D. VI to VIII, 20 to 22. 
A. Ill, 26 or 27. Scales, 6—70 to 72—14 to 16. Eye, 3^ to 3| in head; 
interorbital, 3^ to -1; snout, 4; maxillary, 3|. Body strongly com- 
pressed, the nape and breast especiallj' so; profile above eyes strongly 
concave; mouth oblique, the chin projecting; lower lip thin, without 
frenum; eye rather large; gill rakers close set, long and slender, 20 to 
25 below angle; spinous dorsal low, the spines slender; soft dorsal low; 
caudal peduncle moderate, the fin well forked, \\ in head; pectorals, \\ 
in head; ventrals somewhat shorter; ?>\ to 4 rows of scales on cheek. 
The males have teeth in the upper jaw, sparse, bluntish, wide set, in 
one row, directed forward in line with edge of the bone, those on 
sides of mouth largest; lower jaw usualh" with two or three small 
teeth in front; females toothless. Color, dark olive brown above, the 
lower parts copper}' or golden, with traces of faint dark streaks along 
the rows of scales; chin dusk}-; a dusky spot on upper part of opercle; 
no spots on preopercle or snout. Males with a jet black spot on the 
premaxillary, which is wanting in the females; fins dusky yellowish; 
the anal and dorsal black in front, the ventrals black at tip; a dark 
streak across base of pectoral. 
This little fish is known to us from upward of a hundred examples 
