. Animal activities; a first book in zoo?logy. Zoology; Animal behavior. 124 ANIM/iL ACTIVITIES. The kind of sponge commonly called the hard-head gives a general idea of sponge-structure. The smaller holes on the outside correspond to openings in the ectoderm through which currents of water flow to the interior cavities. The large holes at the top are out-. FiG. io8. —Structure of a Sponge {magnified). A. section of sponge; £, part of a digestive sac; C, one cell from a digestive sac lets for these currents. Along the passageways from these outer holes (inhalent pores) to the larger holes (osc
. Animal activities; a first book in zoo?logy. Zoology; Animal behavior. 124 ANIM/iL ACTIVITIES. The kind of sponge commonly called the hard-head gives a general idea of sponge-structure. The smaller holes on the outside correspond to openings in the ectoderm through which currents of water flow to the interior cavities. The large holes at the top are out-. FiG. io8. —Structure of a Sponge {magnified). A. section of sponge; £, part of a digestive sac; C, one cell from a digestive sac lets for these currents. Along the passageways from these outer holes (inhalent pores) to the larger holes (oscula) there are enlargements which act like stomachs, that is, they take up the food as it passes along in the currents of water. The endoderm cells which line. 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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