. Biology of the seas of the Marine biology -- Soviet Union; Hydrology -- Soviet Union. 810 BIOLOGY OF THE SEAS OF THE crab Munidopsis beringana; the holothurian Psychropotes raripes; Lamellisa- bella zachsi, and the echiuride Tatjanellia grandis. The vertical distribution of the characteristic faunal communities in the sublittoral and bathyal zones of the southern part of the Sea of Okhotsk is well illustrated in Figs. 404 and 405. The Ophiura sarsi biocoenosis is adapted to the coldest layer of the Sea. Brisaster latifrons keeps to a deeper layer of warmer water (1° to 2°),
. Biology of the seas of the Marine biology -- Soviet Union; Hydrology -- Soviet Union. 810 BIOLOGY OF THE SEAS OF THE crab Munidopsis beringana; the holothurian Psychropotes raripes; Lamellisa- bella zachsi, and the echiuride Tatjanellia grandis. The vertical distribution of the characteristic faunal communities in the sublittoral and bathyal zones of the southern part of the Sea of Okhotsk is well illustrated in Figs. 404 and 405. The Ophiura sarsi biocoenosis is adapted to the coldest layer of the Sea. Brisaster latifrons keeps to a deeper layer of warmer water (1° to 2°), and Potamilla symbiotica lives at a temperature above 2°. Cold-water Arctic and Arctic-boreal forms are concentrated in the northern, northwestern and western parts of the Sea on the shelf and in the areas where water has been cooled most. Thermophilic forms are propagated in the eastern Cape Terpemye river Ozernaya 21 23 25. &Echmarachmus Ophiura sarsi Fig. 405. Distribution of bottom group and water masses on cross section from southern part of Sea of Okhotsk, from Cape Terpeniye on Sakhalin to river Ozer- naya in Kamchatka (according to data collected by the Gagara, 1932) (Ushakov). and central parts of the Sea, in both surface and deep layers which are warmed by the Pacific waters which enter through the Kuril Straits, spreading north- wards, northwestwards and westwards in a fanlike movement. The increase with depth of the percentage of thermophilic forms and the decrease of the cold-water forms is also characteristic. This is in contrast with the Sea of Japan; there the cold intermediate layer is absent, and the surface waters are warmed by the Tsushima current but the deep waters, isolated from the Pacific Ocean, have a much lower temperature than those of the Sea of Okhotsk. Gigantism is characteristic of many representatives of the fauna of the deep waters of the Okhotsk Sea; beginning with Balanus evermanni and ending with Psychropotes raripes and Potamilla sy
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