. Text-book of zoology for schools and colleges. Zoology. mollhscoida. 169 nous sac, formed by the endocyst, is pierced by two openings. One of these is the mouth, and it is always surrounded by a circle or crescent of hollow ciliated processes or tentacles (Fig. 76, 2, a). These ciliated tentacles serve partly as respi- ratory organs, and partly to set up a current of water by which floating particles of food are brought to the mouth. The mouth and tentacular crown can be partially or com- pletely pulled into the sac by means of a muscle which is fixed to the gullet (3, g). The mouth leads in
. Text-book of zoology for schools and colleges. Zoology. mollhscoida. 169 nous sac, formed by the endocyst, is pierced by two openings. One of these is the mouth, and it is always surrounded by a circle or crescent of hollow ciliated processes or tentacles (Fig. 76, 2, a). These ciliated tentacles serve partly as respi- ratory organs, and partly to set up a current of water by which floating particles of food are brought to the mouth. The mouth and tentacular crown can be partially or com- pletely pulled into the sac by means of a muscle which is fixed to the gullet (3, g). The mouth leads into a gullet, and that. 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
