Foraminifera listed in p.357 are found in the Natukawa Limestone at Kutta in the Teradomari oil-field, Niigata-ken. Foraminifera from the same place have been described by Prof. H. YABE and Prof. S. HANZAWA (Jap. Jour. Geol. Geogr., Vol.2). About a hundred more species are given in our list. Polystomellina discorbirordes are not very common in our samples.
Pyrgo natukawa n. sp.
Holotype: Preserved in the Institute of Geology, Kyoto Imperial University.
Description: The first chamber elongate oval, inflated, somewhat compressed. The second also inflated, roupded, obliquely embraeing the previoas one.Two chambers visibie. In microspheric form, Triloculina young part covered by the last two chambers. Aperture variable, but two principle types A (Fig.2) and B (Fig.3) are general:
A. Aperture crescentiform narrow slit with a flattened semicircular tooth.
B. Aperture broadly semicircular, or slightly sernielliptical, with no tooth.
Comparisons: Test similar to Biloculina variety of Triloculina cuneata, KARRER, Rep. Voy. Challenger, Zoology, Vol.9, but distinguished from it by its peculiar aperture.
Dimention: Diameter, 0.8mm. Triloculina diameter, 0.4mm.
Observation: This is an interesting BiloculIna species containing the relatively large Triloculina young. It is an unusual example of retardation in palingenesis.
Type locality: Sakaya, near Kutta, in the Natukawa Limestone of the oil-bearing Tertiary of Etigo (Niigata-ken), Japan.

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Calyptogena, DALL, 1891. Type species: C. pacifica DALL, 1891.
The superficial feature of Calyptogena reminds me of some species of the Veneridae, however, considering form the standpoints of hinge teeth and pallial line, the present genus is dealt with Carditidae. This geuus is one of the Nothern Pacific elements. C. pacifica DALL and C. elongata DALL are known from the rather deep water of the Western Coast of Alaska and California, and the fossil species of the former is also known from the Pliocene formation of Los Angels. In the Japanese Islands the present genus has never been known as the living species, however, two species of Calyptogena are roported as the fossil oiies. One is C. paciftca DALL which is noted by Y. OTUKA from the Wakimoto Bed of Oga Peninsula, Akita Prefecture ;anotherone is C. nipponica OINOMIKADO and KANEHAKA from the Usiakuhi Bed (Pliocene) and Kubiki Bed (Mio.-Pliocene) of the Higasiyama Oil-field, Niigata Prefecture. In this article the writer reported the occurrence of a great number of Calyptogena pacifica PALL from the Antral. Bed (Mio.-Pliocene) of the Isikari Oil-field, Hokkaido. Unio moraiensis SuzUKI perhaps will belong to the present one.

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Nerinea cf. wsurgis is a well known Nerinea in Japan-so far as known and was first described by NAUMANN and NEUMAYR from the Torinosu-limestone developed at Torinosu, Togano-mura, Takaoka-gun, Koti-ken. Specimens thought to belong to this form, which were derived from the type locality and stored in the Institute of Geology and Palaeontology, Tohoku Imperial University comprise two different types. As stated in the Japanese text, both types may be easily distinguishable from N. visurgis from the Upper Jurassic of the Northern Germany. One has smooth flanks of the whorls, while the other is characterized by the presence of two tuberculated hands; new names, naurnanni and naumanni neumayri are here given respectively, the former seems to be more common in the Torinosu-limestone developed at Torinosu and its neighbours than the latter.

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This paper deals with a small collection of trilobites procured by LICENT and TEILHARD at Kentingshih, north of Kishan and kept in the Geological Institute of the National University of Peking. For the privilege of studying it I wish to record here my sincere gratitude to Prof. Toru TomrrA of that university and Dr. P. TEILHARD de CHARDIN of the Institut de Geo-Biologie at Peking.

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WALCOTT'S classification of the Corynexochidae was developed by RAYMOND and others. Recently I made a comprehensive study on the Dolichometopinae which is one of the two subfamilies of the Corynexochidae. Excluding 14 species which had once. been thought to be members of the subfamily, it comprises some 125 species, 11 genera including 9 subgenera.

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