NO. 1244. GOBIOID FISHES OF JAPAN— JORDAN AND SNYDER. 
59 
e(|u:il to leiiyth of snout. No papilliv on Inner edge of shoulder girdle. 
Pseudohranchia' hirg-e. Gill-rakers on tirst arch 3 + 9; slender. 
Head naked; no barbels; a trianguhir naked space extending back- 
ward from occiput to insertion of dorsal; bod}' elsewhere covered with 
large, tinely ctenoid scales. 
Dorsals separatt;; spin(\s with tilaraents, the first and second very 
long and slender. Anal tin inserted below second dorsal ray, reaching 
posteriorly as far as the dorsal, ])oth touching base of caudal. Pec- 
torals and caudal I'ather pointed. Ventrals large, free postei'iorly. 
Coloi- in spirits, light olive; throat with a narrow, longitudinal dark 
spot: sides of head and upper parts of body with dark spots, those 
near niiddh^ of sides arranged in an indefinite undulating line. Spi- 
nous dorsal with a wide, black edge; 1)elow this a l)road l)and of pearly 
Fig. 6.— Ctenogobius gymnauchen. 
white; basal half of fin with 3 rows of oval, dusky, or Idack spots; 
soft dorsal similarly colored. Caudal with small, dusky, oval spots on 
interradial membranes, except on lower parts of fin. Anal liroadly 
edged with dusky. Pectorals dusky at Ijase, the dark color fading- 
out toward the edge. Ventrals streaked longitudinally with black. 
Described from a specimen from Enoshima. 
Some individuals are much lighter in color. They have a more or 
less conspicuous dark blotch at base of caudal, and occasional!}" a row 
of 4 or 5 poorly defined small spots along the sides. 
This small prettily colored gol)}' is rather common in Japan, living 
chiefly in the estuaries about and under muddy rocks. Our numerous 
specimens are from Misaki, Wakanoura, Nagasaki, Tokyo Bay, Tsu- 
ruga. and Knoshima. 
[yvfAvnc;, naked; (xvxi'/v, nape.) 
