Though Glossogobius biocellatus (CUVIER et VALENCIENNES) has been recorded in the Ryukyu Islands, there is a record by NAKAMURA (1941) of its having been caught in Japanese waters north of the Ryukyus. However, on November 8, 1962, two specimens of this species were obtained from the mouth of the River Oyodo in southern Kyushu. Their gill membranes are united across the isthmus, and the upper part of the iris makes a small projection into the pupil, as described by TOMIYAMA (1936). The counts and measurements of the two specimens from Kyushu are given in Table 1, together with those of the specimens from the Philippines, and those of the descriptions of HERRE (1927), KOUMANS (1941) and AOYAGI (1957). On the whole, the counts, the measurements and other characteristics of the Japanese specimens as well as those of the Philippine specimens agree well with those given by these authorities. The Philippine specimens are darker in colour than the Japanese specimens, and it is difficult to see the pattern on the ventral fin. One of the two Japanese specimens, in both of which the ventral pattern can be clearly seen, is illustrated in Figure 2. It seems likely that the darker coloration of the Philippine specimens is due to their having been caught during the breeding season.
