. 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. Oceanography. 468 DEPTHS OF THE OCEAN CHAP. - -' ^C' 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 algae little tube- s
. 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. Oceanography. 468 DEPTHS OF THE OCEAN CHAP. - -' ^C' 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 algae little tube- shaped dwellings constructed out of various materials and inhabited by different species of amphipods,1 and here, too, we meet with some kinds of Beautifully coloured nudibranchs (usu- ally species of sEolis, and especi- ally SEolis rufo- branchialis, see Fig- 33o) crawl slowly 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 algae-vegeta- tion of the littoral zone, though they must be very carefully searched for, are rhabdoccelous turbellaria and several species of Halacarids. There are, in addition, quantities of the young of Mytilus, asterids, etc. Among the " roots " of the lamin- aria we frequently get Nereis, Ophiopholis aculeata, and borer (J mussels (Saxicava). Fig. 330. sEolis rufobranchialis, Johnst. (After Alder and Hancock.). Fig. 331. Doris tuberculata, Cuv. (After Alder and Hancock.) Zostera belt. In contradistinction to Laminaria 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 localities (pools, estuaries, etc.) and upon soft muddy bottom. The fauna of the eelgrass is not nearly so rich in species
Size: 2421px × 1032px
Photo credit: © Paul Fearn / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpublisherlondo, bookyear1912
