. The depths of the ocean : a general account of the modern science of oceanography based largely on the scientific researches of the Norwegian steamer Michael Sars in the North Atlantic. "Michael Sars" North Atlantic Deep-sea Expedition (1910); Oceanography; North Atlantic Ocean. 468 DEPTHS OF THE OCEAN is the commonest. With their prehensile claws they climb about among the hydroids and red algae, hooking themselves on by their hind limbs, swaying to and fro for a time, and then catching hold of another branch with their front claws and climbing farther. In fairly sheltered localit
. The depths of the ocean : a general account of the modern science of oceanography based largely on the scientific researches of the Norwegian steamer Michael Sars in the North Atlantic. "Michael Sars" North Atlantic Deep-sea Expedition (1910); Oceanography; North Atlantic Ocean. 468 DEPTHS OF THE OCEAN is the commonest. With their prehensile claws they climb about among the hydroids and red algae, hooking themselves on by their hind limbs, swaying to and fro for a time, and then catching hold of another branch with their front claws and climbing farther. In fairly sheltered localities we often get among the branches of the hydroids and algse little tube- shaped dwellings constructed out of various materials and inhabited by different species of amphipods,^ and here, too, we meet with some kinds of pycnogonids.^ Beautifully coloured ,.y, nudibranchs (usu- ^"^^;''^^'^"-' " ~^ ally species of V^T y^olis, and especi- ^â ^^^^^^^ ^ . s ^jj^ yEolis inifo- * branc hialis, see Fig. 330- Fig. 330) crawl ^olis rufobranclualis, Johnst. (After Alder and Hancock.) slowlv aboUt and feed like the pycnogonids upon the hydroids ; certain kinds of nudibranchs (especially some species of Doris, see Fig. 331, Polycera, etc.) occur chiefly in the winter. Animal groups that are very numerously represented in the algse-vegeta- tion of the littoral zone, though they must be very carefully searched for, are rhabdocoelous turbellaria and several species of Halacarids. There are, in addition, quantities of the young of Myfilus, asterids, etc. Among the " roots " of the lamin- aria we frequently get Nereis, Ophiopholis aculeata, and borer mussels [Saxicava). I n contradistinction ^^^.^ tuberculata, Cm^'V^ftJ; Alder and Hancock.) to Laniinaria hyper- borea, which prefers the most exposed situations, where there are waves or strong currents, as well as hard bottom to which to attach itself, we find the eelgrass [Zostera marina) in enclosed sheltered localitie
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