Abstract
Scales of Chasmichthys dolichognathus dolichognathus, a species of Gobiid fish, are cycloid in the early developmental stage, but as the fish grow up, ctenii are formed on their apical margin, until they become complete ctenoid of Gobiidae type. When the standard body length of the fish attains to 20mm, the formation of ctenii of scales is completed, after which ctenii begin to fall off and gradually decrease in number, finally changing from weak ctedoid with traces of ctenii into the secondary cycloid. Cycloid scales found in adult fish are formed secondarily by the degeneration of ctenii, and they differ accordingly from ordinary cycloid ones primarily appeared. Chasmichthys dolichognathus dolichognathus has hitherto been regarded as primitive in lepidology having so-called cycloid, on the one hand, and as one of the specialized form of Gobiid fish in phylogeny carrying glossopharyngeal bones of L type show by Mr. TAKAGI on the other hand. The contradiction above-mentioned may be dissolved by confirmation of the secondary cycloid scales in this species.
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