. Text-book of zoology for schools and colleges. Zoology. LUCERNAEIDA AND GEAPTOLITIDJj;. 81 The digestive cavity of the polypite gives out from its upper extremity a series of radiating gastro-vascular canals, which proceed toward the margin of the umbrella. These radiating canals are never less than eight in number, and on their way to the margin of the disk they break up into a great number of smaller vessels, which unite with one another to form a complicated net-work. At the margin of the bell they all. Fia. 24.—Generative zooid of one of the Lueernarida (Glvrysama hysosaella). (Afte: Gos
. Text-book of zoology for schools and colleges. Zoology. LUCERNAEIDA AND GEAPTOLITIDJj;. 81 The digestive cavity of the polypite gives out from its upper extremity a series of radiating gastro-vascular canals, which proceed toward the margin of the umbrella. These radiating canals are never less than eight in number, and on their way to the margin of the disk they break up into a great number of smaller vessels, which unite with one another to form a complicated net-work. At the margin of the bell they all. Fia. 24.—Generative zooid of one of the Lueernarida (Glvrysama hysosaella). (Afte: Gosse.) open into a circular vessel, which in turn sends processes into a series of marginal tentacles, which are often of extraordinary length. Besides the tentacles, the margin of the umbrella is provided with a number of marginal bodies, each of which consists of a little collection of pigment or " eye-speck," and a little sac filled with fluid and containing mineral particles. Each of these marginal bodies is covered and concealed from view by a kind of hood derived from the ectoderm. Hence the name of " hidden-eyed " Medusm applied to these forms, in contradistinction to the " naked-eyed " Medusm, in which the eye-specks are exposed to view. The reproductive organs are usually of some bright color, and " form a conspicuous cross shining through the thickness of the ;. 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 Nicholson, Henry Alleyne, 1844-1899. New York, D. Appleton and Co.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectzoology, bookyear1884
