The Hidaka System of Hokkaido is a complex chiefly composed of sandstone, shale, chert, clay-slate, schalstein and limestone ; it is rarely fossiliferous., The fossils, hitherto reported to occur are bryozoas, brachiopods, a calcareous alga and a tabulata coral., Among the material from the provinces of Hidaka and Isikari now at hand, the writer could distinguish three different species of Batostomella and a calcareous alga, gen., et sp., indet ; besides there is one specimen of Chaetetes sp., in a limestone boulder from Kitami province., Batostomella sp., (1) is similar to B., columnaris (SCHLOTHEIM) of WAAGEN and WENTZEL from the Productus limestone of the Salt Range ; Batostomella sp., (3) is quite identical with the one from Hirabara in the Akiyosi district, where many bryozoas and tetracorals of Permian nature occur in association, and Batostomella sp., (2) though more or less problem-atical in its generic position distinctly exhibits characters of the Palaeozoic Trepostomata., The same calcareous alga as that found in this Batostomella limestone also occurs in a limestone of Nukata in Amata province, from where several other fossils of Permian nature are known., Chaetetes sp., is specifically indeterminable, however, it is in its internal characters quite identical with a species common in the Moscovian limestone from Japan Proper., On these fossil evidence, the Permian age of the Batostomella limestone and the Middle Carboniferous age of the Chaetetes limestone seem to be evident.,