In this area, there are many submarine canyons and these canyons end in platform of 2000 m depth. Coarse sediments distribute along 1000 m depth curve.
Bottom sample from continental slope were analyzed by the second author. The results are shown in table 1 and 2 which show a similarity of chemical compositions between blue mud on marginal sea bottom (Hamaguchi and others, 1953) and continental slope.

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The wind-driven circulation in an ocean with two layers of different density structure is treated. The density in the upper layer is vertically uniform and the density in the lower layer is expressed by an exponential function of the depth approaching to the constant value at the bottom. Two equations about the depth of the upper layer and the thickness of thermocline of the lower layer are derived from the vorticity equations. In case of horizontally uniform density of the upper layer, circulation in that layer is similar to that of a barotropic ocean under the westerlies over the northern half and easterlies over the southern half. The contours of the upper layer depth correspond to this circulation but those of the thermocline thickness counterbalance their effect so as to make the transport in the lower layer vanish everywhere. In case of northward increasing upper density, the north-south symmetry of the circulation is lost with more narrow and strong eastward current along the northern edge. The circulation in the lower layer becomes finite but is important only near this eastward current. The upper layer depth increases conspicuously northward to the maximum zone just south of the eastward flow but the thermocline thickness slightly decreases northward.

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We consider that frequent occurrences of the sharp rising and dropping in the water temperature of Yakushima Coastal Area is caused by the variation of Kuroshio in this area. We investigated the relationship between the variation of Kuroshio in this area, the meteorological phenomena and the variation of the water temperature of the Yakushima Coastal Area and reported the results of this investigation.

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In this paper, the kinds, the formation and the mixing of the water masses in the Tsushima Current area are discussed by making use of the results of the oceanographical observations carried out until now. The outstanding features are as follows:
1. The water, which passes the eastern canal of the Tsushima Strait, is the oceanic surface water mixed slightly with the coastal water of the East China Sea, and the one, which passes the western canal, is composed of the oceanic surface water mixed remarkably with the coastal water of the East China Sea and the western North Pacific central water indicated by SVERDRUP. The central water advances ascending toward the north-west along the bottom of the sea valley west off the Kyfishil district and flows into the Japan Sea.
2. In the sea west off the Kyfishil district, lateral mixing is dominant between the oceanic water and the coastal water of the East China Sea.
3. In the Japan Sea, sinking of surface water seems to lead the formation of the Japan Sea central water whose temperature-salinity curve is reflected to the temperature-salinity relation at the surface layer in late winter.
4. The arrangement of the water masses in the Tsushima Current area of the Japan Sea in a vertical direction is considered to be such that the water which has flown into the Japan Sea from Tsushima Strait, the Japan Sea central water, the intermediate water and the deep water.

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From the water budget in the subarctic North Pacific Ocean, it can be pointed out that there exists a western boundary northward current in deep depths below the southward flowing Oyashio, and on an average, sinking occurs in the upper layer above 1100 m depth and upwelling occurs in the lower layer below 1100 m depth in the whole region of the Subarctic North Pacific.

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The nonmetallic constituents of deep-sea fishes, Katsuwonus pelamis and Monocentris japonica were investigated.
Phosphorus, sulfur, chlorine and carbon containing in the ashes obtained by burning these fishes at 500-550°C were determined.
The milligram equivalents of these elements per 1 g of ashes are as follows: -
P: 19.4-8.46, C: 2.86-0.0, Cl: 2.31-0.14, S: 0.6-0.0
Phosphorus is the main constituent of the ashes, and amounts to 30-40% in weight as oxide.
In the case of Katsuwonus pelamis Phosphorus is most contained in white flesh and secondarily in gills and red flesh, while in Monocentris japonica most contained in head and secondarily in bones and flesh containing bones.
Chlorine is most found in the deep-sea fishes and in the heart of Katsuwonus pelamis
Sulfur is most found in the red flesh of Katsuwonus pelamis and the deep-sea fishes.
Carbon (CO₃) is most contained in bones, cuticles and deep-sea fishes' bodies.
It is supposed that CO₃ is generated from both the carbonates which originally construct the bone, head and other parts, and those which were secondarily made by burning these fishes' bodies.

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Some important behaviors of trace elements in the living body have recently been made clear. As an example some of trace elements are found in blood or enzyms and behave as a catalyst in the biochemical reactions.
The investigations on the distribution of trace elements in the bodies of sea fishes may afford some contributions to the problems on the behaviors of trace elements in the living bodies.
In this paper the distributions of Zn, Cu and Pb in the sea fishes as deep-sea fishes, Katsuwonus pelamis and Monocentris japonica are reported.
These three elements were isolated by the ion exchange resin from the solution obtained by dissolving the ashes of fishes in HNO₃; and also these three were simultaneously determined by the polarographic method.
In the bodies of these fishes, Zn is most aboundant, Cu is secondarily and Pb least.
Generally Zn is rich in flesh but poor in bones. Cu is rich in deep-sea fishes such as Chlorophthalmus albatrossis albatrossis (Aome-eso) and Synagrops japonica (Sumikuiuo) and Pb is most rich in the gills and the heart of Kastutvonus pelamis.
The scale of Monocentris japonica, and the stomach and heart of Katsuwonus pelamis contain Cu more than the other parts respectively.

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This report deals with a relation between the seasonal changes of plankton and the sea conditions in Ise Bay based on the observations covering from Oct., 1950 to Dec., 1951.
In Ise Bay less haline water which is affected by land drainages extends to southward from innermost part of the bay along the west coast, while haline water invades northward from the entrance to the eastern part of the bay. Distribution of both waters is shown by the horizontal distribution of chlorinity in the surface. The borders of both waters are usually found near the isohaline lines of 15 and 17 Cl‰, namely horizontal gradients of surface chlorinity becomes steep near the both isohaline lines in every month. The extentions of the waters are represented by the location of both isohaline lines in the bay. Distributions of phytoplankton have intimate relation with the one of chlorinity; accordingly, most abun-dant regions of various species appear separately in three regions - more than 17 Cl‰ 15-17 Cl‰ and less than 15 Cl ‰ - according to their responses for chlorinity. This division corresponds to following three groups in annual changes of phytoplankton appearrance: 1) Oceanic group. The species belonging to this group occur in most haline seasons at the sea area near the entrance of the bay. 2) Neritic group I. Main populations are found in the innermost part of the bay in haline seasons and in the sea near the entrance in less haline seasons. 3) Neritic group II. Usually appears near the innermost part of the bay. In some stenothermal species, however, the distributions are affected by the changes of temperature.
In zooplankton, eury-haline neritic species and larvae of coastal benthic animals are dominant, because of extreme less haline of the water. Oceanic species appears only here and there in the invading water in most haline months from Oct. to Dec.

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