Archive image from page 502 of The depths of the ocean. 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 depthsofoceangen00murr Year: 1912 et numbers of attached forms, synascidians (see Fig. 327), and calcareous sponges. Halichondria panicea, one of the few siliceous sponges of the littoral zone, also Fig. 327. Synascidian : Polycycli/sficscus, Huitfeldt Kaas. Fig. 328. Obelia ge7iiculata, L. (After Hincks.) frequently forms a thick covering over long pie
Archive image from page 502 of The depths of the ocean. 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 depthsofoceangen00murr Year: 1912 et numbers of attached forms, synascidians (see Fig. 327), and calcareous sponges. Halichondria panicea, one of the few siliceous sponges of the littoral zone, also Fig. 327. Synascidian : Polycycli/sficscus, Huitfeldt Kaas. Fig. 328. Obelia ge7iiculata, L. (After Hincks.) frequently forms a thick covering over long pieces of the stalks. On the blades of the laminaria two forms are very common, namely the bryozoan Membranipora nievibranacea, which makes a white covering over large portions, and the little hydroid Obelia genicidata (see Fig. 328). An unattached form, the gasteropod belonging to the Patellid family [Nacel/a pelhicida), is very conspicu- ous, owing to its handsome blue- striped shell, and lives exclusively on the laminaria. Besides the fig. 329. I 1 c Caprella linearis, L. attached lorms, that often completely cover the lower parts of the laminaria, there are unattached species in great abundance existing upon or among them. The best way of observing them is to shake a thickly overgrown laminaria stalk, placed in a large glass of sea-water, when we may perceive swarms of amphipods, worms, tiny mussels and snails, little starfishes, and other creatures. The most noticeable of the amphipods are the elongated and strangely built caprellids, of which Caprella linearis (see Fig. 329) A species of Nicolca is common.
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