. Animal activities; a first book in zoo?logy. Zoology; Animal behavior. Fig. 126.—Cross-section of Anodon. «, intestine; z'.^'., heart; and , gills; /, foot; mJ., Fig. 127.—Nervous System of Ano- don. c.^., ganglia near the mouth; P-^-, ganglia of the foot; , ganglia of the posterior adductor. more cells like themselves or to manufacture intercel- lular structures. The. cells of the mantle secrete carbonate of lime, which forms in layers on the inside of the shell and along its edges, thus increasing both its thickness and its size. If the mantle be irritated by the intr
. Animal activities; a first book in zoo?logy. Zoology; Animal behavior. Fig. 126.—Cross-section of Anodon. «, intestine; z'.^'., heart; and , gills; /, foot; mJ., Fig. 127.—Nervous System of Ano- don. c.^., ganglia near the mouth; P-^-, ganglia of the foot; , ganglia of the posterior adductor. more cells like themselves or to manufacture intercel- lular structures. The. cells of the mantle secrete carbonate of lime, which forms in layers on the inside of the shell and along its edges, thus increasing both its thickness and its size. If the mantle be irritated by the introduction of minute particles of foreign matter or by disease the secretion of carbonate of lime at a defi- nite point is hastened and a pearl is formed. Respiration. As the water passes through the gills it flows over and around many blood-vessels, through. 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 French, Nathaniel Stowers, 1854-. New York [etc. etc. ] Longmans, Green and Co
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