The free oscillation of water in a rotating rectangular basin of variable depth is discussed. The depth is assumed to decrease from the center to the edges according to a paraboloidal law. The solution is obtained in terms of double series of zonal harmonics. Numerical solutions were worked out. Complete sets of modes will be evaluated by an electronic computer.

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Observations of temperature fluctuations and simultaneous observations of temperature and salinity fluctuations conducted in the sea are carefully analyzed on the theoretical basis developed in Part I. Observed remarkable fluctuations of about 10 minutes period are considered to agree with the unstable oscillations obtained from the theory. Actual oscillations observed in the sea are regarded to have small wave length such that they satisfy the condition (F) described in the Section 1 of Part I.

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Between late January and March of 1966, the western Subarctic region was widely investigated by MV Argo and MV G. B. Kelez. That is the first oceanographic measurement in this region during winter season. Oceanographic conditions and relative transports are discussed using these data. The Alaskan Stream which is closely related with the formation of the salmon fishing ground, is continuous as far west as long. 170°E and the westward transport of 8×10⁶m³/sec occurs across long. 165°W. That are similar to the conditions in summer. The isolated warm water mass separated from the Alaskan Stream is more clearly defined as a clockwise gyre at the west of Komandorski Ridge.
Transport of approximately 9°10⁶m³/sec in the East Kamchatka Current reaches east of the Kurile Islands, where its water, mixing with the Okhotsk Sea water, forms the Oyashio Current having the volume transport of 7×10⁶m³/sec.
Generally, the circulation pattern in winter is similar to that in summer. Schematic diagram of relative transport and circulation in the Subarctic region in the North Pacific Ocean in winter is proposed.

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A considerable number of Euphausia similis G. O. SARS were found to be infected with a parasite in the samples collected in the summer of 1969 in Suruga Bay. The same species was also parasitized by an ellobiopsid, Thalassomyces fagei (BOSCHMA), but it was rare in occurrence. The former parasite is slightly oval in shape with the longer diameter ranging between 1.0 and 1.5 mm, average diameter 1.35 mm. It infests cardiac region, rarely gastric region, of the host. It has been preliminarily identified by Drs. T. OSHIMA and T. SHIMAZU of the Shinshu University as the progenetic metacercaria of a trematode species very closely related to Pseudopecoelus japonicus; its adult was originally reported to infest several bathypelagic fishes and the encysted stage was also found in jack mackerel from Suruga Bay by YAMAGUTI (1938). The occurrence of the metacercaria in E. similis from the area may be new to science, although G. O. SARS (1885) has reported the immature forms of Distomum filiferum G. O. SARS in Nematoscelis megalops G. O. SARS and Thysanoessa gregaria G. O. SARS and the crustaceans of wide variety have been proved to serve as the second intermediate host of various trematodes. The euphausiids infected with the metacercaria were concentrated in the innermost part of the bay. This might suggest the presence of the euphausiid population which is confined to the geographical area for some period. The metacercaria may be used as a “biological tag” to trace the migratory range of the host when the life history of the parasite is elucidated. The finding of T. fagei in the area may be the first record of occurrence of the species in the western North Pacific, and E. similis is now recorded as the fourteenth known host euphausiid of the ellobiopsid.

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Based on the experimental result, ε∝l^-0.5, previously obtained, a hypothesis of turbulent energy spectrum in steady state is presented by introducing local energy supply, q. The foundamental relations are q.=The foundamental relations are q=∂ε/εκ and ∂q=const., where κ is the wave number.

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Geographical distributions of upwelling centers off the coast of Peru are studied on the basis of monthly mean wind data during 17 years from 1939 through 1955. Three remarkable upwelling centers are found near 5°S, 11°S and 15°S, from the analyses. With regard to the negative surface divergence found in the offing of Huacho-Callao (near 11°S) in August, it is pointed out that a local high pressure cell is generated in the atmosphere.

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