. 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. Fig. 389. Acanthometro?i pellucidum, J. Miiller. (After Hertwig, from Steuer.) Fig. 390. Acanthonidium echinoides, Claparede and Lachmann. (From Popofsky.) The Aulacanthidae are spherical, the skeleton consisting of numerous isolated hollow needles, some of which radiate from the centre while other smaller ones are arranged along the surface of the sphere. The great majority of the Aulacanthidae
. 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. Fig. 389. Acanthometro?i pellucidum, J. Miiller. (After Hertwig, from Steuer.) Fig. 390. Acanthonidium echinoides, Claparede and Lachmann. (From Popofsky.) The Aulacanthidae are spherical, the skeleton consisting of numerous isolated hollow needles, some of which radiate from the centre while other smaller ones are arranged along the surface of the sphere. The great majority of the Aulacanthidae have been found in the north-western corner of the Atlantic (the Irminger Sea and Davis Straits), and also south of the Cape Verdes, but several species are very widely dis- tributed, for instance Aulographis pandora (Fig. 392) taken in the Mediterranean, Indian Ocean, Paci- fic, and also in the Atlantic north and south of the Equator. This species occurs between 400 and 1000 metres, and is considered specially characteristic of these depths. One of the best-known species, A ulacantha scolymantha (see Fig. 393), is found, like several other radiolarians, in two races distinguished by their difference in size. One is a pygmy to mm. in diameter, the other a giant about 3 millimetres in diameter. At Naples, and during the cruise of the " Valdivia," Haecker1 studied the bathymetrical 1 V. Haecker, "Tiefsee-Radiolarien," Wiss. Ergeb. "Valdivia" Expedition, Bd. xiv. (Jena, 1908).. Fig. 391. Acanthostaurus ?iordgaardi, Jorgensen (~\-)- (From Jorgensen.). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Murray, John, Sir, 1841-1914; Hjort, Johan, 1869-. London Macmillan
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