NO. 1265. SALMONOID FISHES OF JAPAN— JORDAN AND SNYDER. 589 
lateral .series 57 to 62; two specimens from Same have the dorsal rays 
9, anal 14 and 15, scales 57; one from Matsushima has dorsal 9, anal 
15, scales 56. Two specimens from Grantley Harbor and two from 
Port Clarence, which we identify with this species, have the dorsal 
rays S or 9, anal 14, scales 57 to 60. 
Common in northern Japan, inhabiting the bays in large numbers. 
Our specimens are from Aomori, Same, and Matsushima. It ranges 
northward to Kamchatka and eastward to Alaska. 
{Olidus^ 0%-) 
13- MESOPUS JAPONICUS Brevoort. 
CHIKA; WAKASAGI (YOUNG SAGI). 
Osmerus olidiis (called Osmerus japonicus on plate) Brevoort, Exped. Japan, 
1856, p. 278, pi. X, fig. 2; Hakodate. 
Osmerus oUgodon Kxer, Fische. Naturh. ^luseum, Godeffroy, 1865, p. 9, pi. xiv, 
fig. 1; Decastris Bay, Manchuria. 
Mesopns olidus GIinther, Cat., YI, 1866, p. 169; in part. 
Head 5 in length; depth 5i; depth of caudal peduncle 3 in head; 
eye 4; interorbital space 3i; snout 4; D. 9; A. 13; scales in lateral 
series 65, in transverse series between ventral and dorsal 14. 
Body long, somewhat compressed, the head short and pointed. 
Interorbital space broad, flat, or slightly convex. Snout about equal 
in length to diameter of orbit, pointed, the lower jaw slightly pro- 
jecting; mouth small, the maxillary extending to a vertical through 
anterior edge of pupil, lower outline of maxillary convex, rounded 
posteriorly. Teeth minute, on jaws, vomer, palatines, pterygoids, 
and tongue, those on the tongue largest. Pseudobranchite present. 
Gill-rakers on first arch 9 + 21, very long and slender. Scales large, 
smooth, easih" displaced. Lateral line not very conspicuous, passing 
along the eighth series of scales below dorsal. Dorsal inserted near 
middle of body, half way between tip of snout and base of caudal fin, 
the anterior rays highest, If in head. Anal low, the highest rays 2f 
in head. Caudal deeply forked, about equal to length of head. Ven- 
trals inserted below second or third dorsal ray, li in head. Pectoral 
ravs 13; length If in head. 
Alcoholic specimens show a broad, silvery lateral band alongside of 
body, the scales on upper half of body edged with dusky dots, the top 
of head dark. 
The figure named Os7nerus japonicu^s by Brevoort, though crude, 
serves well to distinguish this species from Jfesojms olidus. The 
posterior position of the vcntrals and the short anal base are dis- 
tinctly shown. In Mesopus olidus the ventrals are inserted immedi- 
ately below or anterior to the first ray of the dorsal, and the anal base 
is longer, the fin having 16 rays. 
We have two specimens of Mesopus japonicus about 170 millimeters 
