65. On the Japanese Species of Nonion and Its Allied Genera

Abstract

Of the 12 forms described, 2 are known only as fossil, namely, Nonion manpukujiense OTUKA and N. pompilioides etigoense n. subsp. Of the other 10 forms, N.pompilioides (FICHTEL and MOLL) and N.subturgidum (CUSHMAN) are inhabitants of the warm waters southward from Japan at the present time, while N. scaphum (FICHTEL and MOLL), N.grateloupi (d'ORBIGNY), N. cf. umbilicatulum (MONTAGU) and Astrononion stelligerum (d'ORBIGNY) have a world wide distribution, both fossil and recent. N.japonicum n.sp. occurs commonly in the surrounding waters of Japan, as well in its Plio-Pleistocene materials.
Among the fossil forms, it is noteworthy that N.pompilioides etigoense n. subsp. is always found in association with Polystomellina discorbinoides YABE and HANZAWA and Cassidulina yabei ASANO and NAKAMURA, which are two characteristic Pliocene Foraminifera of Japan. N.manpukujiense OTUKA is common in the Plio-Pleistocene of Tiba, Kanagawa, Sizuoka and Kôti prefectures.
Finally I wish to offer my warmest thanks to Prof. H. YABE of the Institute of Geology and Palaeontology, Tohoku Imperial University, Sendai, Japan, under whose direction I am studying the Neogene Foraminifera faunas of Japan, for kindly correcting and reconstructing this note before publication.