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During the previous year, a feature, which seemingly indicates seasonal change of growth, was discovered in some Palaeozoic Tetracorals by the present authors) ; this event lead him to examine numerous samples of recent as well as fossil corals preserved in our Institute of Geology and Palaeontology, Tohoku Imperial University, Sendai. The same feature was also found in some Stromatoporoids, Tabulates and Bryozoa as well as fossil and recent Hexacorals. In these forms the vesicular or horizontal tissue is arranged in different densities at different hieghts above the base of the corallite ; namely, a part of the corallite in this type is provided with minute, densely crowded and thickened dissepiments or vesicles, while the parts underand overlying it possess larger, less crowded and not thickened dissepiments or vesicles. In general these alternatelayers show rather insensible transition from one to another, but sometimes the upward gradation from a layer with minute elements to another with larger ones is more or less abrupt. Favia speciosa (Dana) which is to be dealt with in this paper also exhibits such features. The samples studied were obtained from various places lying between Palau Islands at the south and Honsyu (the main island of Japan) at the north ; observations on the recent specimens displaying seasonal change of growth resulted in being very strongly developed in those of Honsyu Island, moreor less feebly in the Ryukyu Group, scarcely observed in the specimens from the Mariana and Marshall Islands, and quite wanting in those from Palau Islands. Measurements of cycle of growth revealed that those of the north are much shorter than those of the south. The measurement of the recent samples as well as semi-fossils from the raised coral reef together with fossils from the Ryukyu limestone are as follows :

proceedings of the imperial academy

On the Seasonal Change of Growth in a Reef Coral, Favia speciosa (Dana), and the Water-Temperature of the Japanese Seas During the Latest Geological Times