The geological features of Japanese Central Alps, which correspond to the northeastern end of the Ryoke metamorphic zone, are outlined. 1) The Paleozoic rocks here, which belong to the later Paleozoic geosynclinal deposits of Japan, consist chiefly of sandstone, slate and chert. The most remarkable fact is that the upper part of the whole series frequently contains the conglomerate-looking facies in which elongated angular fragments are scattered in sandy matrix. For this occurrence should be invoked the frequent subaqueous sliding at the time of deposition. Moreover, the traces of the organism which are similar to Helminthoidea in the Alpine Flysch, are found frequently in the upper part of the slate lamina alternating with sandstone. From these facts, we can conclude that the depositional features are rather of the Flysch type. Judging from the existence of Yabeina limestone, the upper part of the whole series seems to be not older than the later stage of Middle Permian. 2) Essentially, there is no structural difference between the metamorphics and the nonmetamorphosed Paleozoic rocks and, also, is no remarkable zone of discontinuity or tectonic line which separates the both. 3) Metamorphic rocks are divided, progressively from NW to SE, into the zone of biotite slate, the zone of schistose hornfels and the zone of banded gneiss. The zone of biotite slate is widely developed, and makes a gradual transition to the non-metamorphosed Paleozoic rocks, lacking the chlorite zone or phyllitic zone between them. From these facts and the other petrological data, the metamorphism seems to be similar to the contact metamorphism and, possibly, to be achieved under the rather static condition v ith less stress due to tectonic deformation. The extension of metamorphism is, however, so regional that it defines the axial metamorphic zone of upper Paleozoic orogenic belt in the South-west Japan, 4) The granitic rocks occupy the wider part of the Ryoke zone than the metamorphics. They are grouped into four types, namely the Ichida granite, the Otagiri granite, the Inagawa granite and the Kisokoma granite. The Kisokoma granite, which has the discordant outline to the surrounding metamorphics, also occurs far west to the exterior of the Ryoke zone. While the others expose exclusively in the Ryoke zone and are rather conformable to the structure of the metamorphics. But the succession of the intrusion of the Kisokoma granite and the others cannot be concluded at present. Two facts of the nature of the granites are worth mentioning; the intrusion of the Otagiri granite is connected with the upheaval movement of the zone of banded gneiss, and both the Ichida and the Otaoiri granites seem to be produced through the granizatization process of meta-diabasic rocks.

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The Hitotsunashi (or Naradani) district lies on the southwestern margin of the Hida Gneiss Region which is considered as the Pre-Cambrian basement underlying the Palaeozoic (Gotlandian to Permian) formations in Central Japan. In this district, an interesting conglomerate-schists occur and the origin of pebble-like granitic rocks included in this schist and their stratigraphic situation have been discussed by many researchers in the last few years. The discussions were focussed especially on the following two points : the one is the problem whether the granitic rocks are true pebbles of sedimentary origin or torn intrusive granitic veins of apparently pebbly shape, and the second is concerned with H. HUZIMOTO's view that the schists may correspond to the basal conglomerate of the Gotlandian formation of this district and the granitepebbles may have been derived from the Mugishima granites which are regarded as a member of the Hida Gneiss Complex. According to the author's observation, the Hitotsunashi conglomerate-schists bear both kinds of granitic rocks mentioned above. The photos 1, 2 and 3 in P1. I present excellent exemples of granitic veins injected under shearing condition. A rounded pebble of porphyritic granite is illustrated in the photo 4 in Pl. I. In the next, the author observed the petrographic characters of various pebbles contained in the Hitotsunashi conglomerate-schists and noticed the remarkable resemblance between pebbles of the Hitotsunashi c Dnglomerate-schists and those of the so-called "Usuginu Conglomerate" of Middle to Upper Permian in age. The photos 2, 4 and 5 in Pl. II show pebbles of porphyritic granite of the 'Hitotsunashi conglomerate-schists. A similar figure of a granite pebble of the Usuginu conglomerate is presented in photo 6 in Pl. II. Photos 7 and 8 in Pl. II. are pebbles of granophyre in the Hitotsunashi conglomerate-schists and the Usuginu conglomerate, respectively. Through the Palaeozoic formations in Japan, the Usuginu conglomerate is the one and only example that bears a considerable amount of granite pebble. From any Gotlandian or Devonian conglomerate in Japan, no granite pebble has been found. In conclusion, HUZIMOTO's view that the Hitotsunashi conglomerate-schists may represent the basal conglomerate of the Gotlandian formation should be carefully re-examined.

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In this paper we described the analytical method of the amino acids of the fossil teeth (Proboscidea), i. e. hydrolysis of organic constituents and desalting, quantitative and qualitative analysis of amino acids. The results performed by the analyses are shown in Figs. 8, 9 and on Table 3, and also we compared one of our results with those hitherto published.

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