Natural history of animals; . ten called a Nautilus,— the true Nautilus is another animal, — and it hasfrequently been erroneously stated that it sails on thesea by spreading its sail-shaped arms to the breeze. Octopus. The Octopus, or Poulp, Figure 357, has no outsideshell, and the arms are united at the base by a varies from one or two inches to two feet in length,and has only eight arms. Squids, or Loligos, and Cuttlefishes. Squids have a long body; broad, fin-like organs atthe hind extremity; and along and slender internalshell which, from its shape, is called a pen. Theyare from on
Natural history of animals; . ten called a Nautilus,— the true Nautilus is another animal, — and it hasfrequently been erroneously stated that it sails on thesea by spreading its sail-shaped arms to the breeze. Octopus. The Octopus, or Poulp, Figure 357, has no outsideshell, and the arms are united at the base by a varies from one or two inches to two feet in length,and has only eight arms. Squids, or Loligos, and Cuttlefishes. Squids have a long body; broad, fin-like organs atthe hind extremity; and along and slender internalshell which, from its shape, is called a pen. Theyare from one to two feet and a half long, and, like Cut-tlefishes, have ten arms, two of which are longer thanthe others. By filling their body with water, and then 208 MOLLUSKS : CEPHALOPODS. forcibly ejecting it, they send themselves backwardsthrough the water with the swiftness of an arrow. Im-mense numbers are used for bait in the cod giant squid are related in structure to these smallerones. Fig. 360. — Fig. 361. — Pearly Nautilus. Much and Indian Oceans. NAUTILI AND AxMMONITES. 209 Cuttlefishes resemble Squids, but have two of thearms or tentacles much lengthened and expanded attheir tips; and they have a broad, internal shell, calledcuttle bone. This is the cuttle bone which is givento canary birds. On the coasts of the Eastern Mediter-ranean, Cuttlefishes are so abundant that the cuttlebones are thrown up by the waves into ridges miles inlength. Like other Cephalopods, Cuttlefishes have thepower of clouding the water by ejecting an inky fluidinto it when they wish to escape. This ink, whendried and prepared, is the sepia used in painting. Spirula. The Spirula resemble those just described, but havea coiled shell inside, Figure 360, and the shell is dividedby partitions into chambers. Nautili and Ammonites. The Nautilus is the only living Cephalopod whichhas an external chambered shell. Figure 361 showsthe Nautilus as it appears when
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
