從來記載並に報告された日本産Cancellaria中化石として見出されるものに就きて, 整理を試みて得た結果を記したものである。次の11種及び1亞種が化石として日本に産出すると認められる。即ち C. hukusimana NOMURA and HATAT, 1936 C. kobayashii (YOKOYAMA), 1927 C. kurodai (MAKIYAMA), 1927 C. limata YOKOYAMA, 1928 C. macrospira ADAMS and REEVE, 1850 C. nodulifera SOWERBY, 1855 C. pristina (YOKOYAMA), 1923 C. reeveana CROSSE, 1863 C. reeveana, laticosta, LÖBBECKE, 1887 C. spengleriana, DESITAYES, 1830 C. taiwa, nensis NOMURA, 1935 C. thomasiana CROSSE, 1861 尚ほ朝鮮産新種Cancellaria tyosenensis HATAI and NISIYAMAを見出した。 尚ほ筆者等の1人畑井が先般略ゝ同様な方法で得た日本産化石Dosiniaの結果とCancellariaの夫れとの相違黙及び類似點, 並にその點等の依って來ると思はれる原因等に關して論じたものであり, Dosiniaに比してCancellariaは個體数並種數に於て遙かに劣勢なことは著しいことである。
The Nobe river takes its rise in the Nokogiri Mountain and flows into the Sinano river. The town of Oziya lies approximately 2 km. southwest of the mouth of the Nobe Along this valley, there are good exposures of the Tertiary sediments which constitute the Higasiyama Oil Field. Figure 1 shows a geological section along the valley. With the object of making a study of the variation in the micro-fauna, twenty samples containing foraminiferal fossils were collected along the valley. Of those twenty samples, two were collected from the Siroiwa Bed, one from the Usigakubi Bed, fourteen from the Ifigasiyama Bed, and three from the Araya Bed. No fossils were found in the Wanatu Bed within the valley, but the underlying sediments contained plentiful micro-fauna. Organisms were found to be most abundant in the more shaly beds. The accompanying chart [Pl. 21 (11)] indicates localities and variations in micro-faunal content and the faunal abundance is shown by symbols on the legend of the chart. Horizontal lines have been drawn between the symbols of abundance in order to aid in recognizing zonal changes, and the dotted lines have been prepared to show the common species found in the Haizume Bed of Nisiyama Oil Field which is correlated to the Siroiwa Bed. of Nisiyama Oil Field which is colleated to the Siroiwa Bed. Table 1 shows the number of families and genera, and the total number of different species, varieties, and indeterminable species in the Siroiwa, Usigakubi, Iligasiyama, and Araya Beds. Table 2 shows the percentage of different species, varieties, and indeterminable species belonging to each family, in relation to the total number of different species, varieties, and indeterminable species in each bed. Figure 2 is a graphic representation of the data in this table. In order to give an idea of the relative abundance of the different families in each bed, a value is assi, ned to each symbol in the accompanying chart:×;=5, Ο=30, Ο= 75, Ο=150. Table 3 shows the percentage of each family in the four beds. Figure 3 is a graphic representation of the data in Table 3.