. Text-book of zoology for schools and colleges. Zoology. DIVISIONS OF THE HTDKOZOA. 67 into a tubular cavity, which is everywhere excavated in the substance of the ccenosarc (Fig. 17, b). The nutrient parti- cles obtained by each polypite thus serve for the support of. Fig. 17.—a iSerfularia (Dipliasia) pitvnata^ natural size; a' Fragment of the same en- larged, carrying a male capsule {o\ and showing the hydrothecse (A) j 6 Fragment of Campam/ula/Ha neglecta (after Hincks), showing the polypites contained in their hy- drothecse (A), and also the point at which the ccenosarc communicates with
. Text-book of zoology for schools and colleges. Zoology. DIVISIONS OF THE HTDKOZOA. 67 into a tubular cavity, which is everywhere excavated in the substance of the ccenosarc (Fig. 17, b). The nutrient parti- cles obtained by each polypite thus serve for the support of. Fig. 17.—a iSerfularia (Dipliasia) pitvnata^ natural size; a' Fragment of the same en- larged, carrying a male capsule {o\ and showing the hydrothecse (A) j 6 Fragment of Campam/ula/Ha neglecta (after Hincks), showing the polypites contained in their hy- drothecse (A), and also the point at which the ccenosarc communicates with the stomach of the polypite (c). the entire colony, and are distributed throughout the entire organism. The nutritive fluid prepared in the interior of each polypite gains access through the above-mentioned aperture to the cavity of the ccenosarc, which, by the combined exer- tions of the whole assemblage of polypites, thus becomes filled with a granular nutritive liquid. This ccenosarcal fluid is in constant movement, circulating through all parts of the colony, and thus maintaining its vitality—the cause of the movement being probably due, in part, at any rate, to the existence of vibrating cilia. The process of reproduction varies somewhat in different members of the order. In all alike, however, the ordinary polypites are incapable of producing the essential elements of reproduction, and for this purpose special generative buds have to be developed. In the typical Sertularians the re- productive buds are developed at certain seasons in great numbers, and they constitute what used to be called 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
