. Comparative zoology, structural and systematic : for use in schools and colleges. Zoology; Anatomy, Comparative; Physiology, Comparative. 280 COMPARATIVE ZOOLOGY. straggler of a mighty race dwells in the deep parts of the Indian Ocean, crawling on the bottom; and, while the shell is wTell known, only a few specimens of the animal have ever been obtained. 2. Dibranchs.—These are the most active of Molhisks, and the tyrants of the lower tribes. Among them are the largest of invertebrate animals. They are naked, hav- ing no external shell covering the body, but usually a horny or calcareous par
. Comparative zoology, structural and systematic : for use in schools and colleges. Zoology; Anatomy, Comparative; Physiology, Comparative. 280 COMPARATIVE ZOOLOGY. straggler of a mighty race dwells in the deep parts of the Indian Ocean, crawling on the bottom; and, while the shell is wTell known, only a few specimens of the animal have ever been obtained. 2. Dibranchs.—These are the most active of Molhisks, and the tyrants of the lower tribes. Among them are the largest of invertebrate animals. They are naked, hav- ing no external shell covering the body, but usually a horny or calcareous part within. They have a distinct head, prominent eyes, horny mandibles, eight or ten arms furnished with suckers, two gills, a complete tubular fun- nel, and an ink-bag contain- ing a peculiar fluid (sepia), of intense blackness, with which the water is darkened to fa- cilitate escape. They have the power of changing color, like the Chameleon. They crawl with their arms on the bottom of the sea, head downward, and also swTim backward or forward, usual- ly with the back downward, by means of fins, or squirt themselves backward by forc- ing water forward through their breathing funnels. The Paper Nautilus (Ar- gonauta) and the Poulpe (Octopus) have eight arms. The female Argonaut secretes a thin, unchambered shell for carrying its eggs. The Squid (Loligo) and Cuttle-fish (Sepia) have ten arms, the additional pair being much longer than the others. Their eyes are movable, while. Fig. 248.—Cuttle-fish {Sepia officinalis); one fifth uatural size. Atlantic 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 Orton, James, 1830-1877; Birge, E. A. (Edward Asahel), 1851-1950. New York : Harper & Bros.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectzoology, bookyear1883
