. The elementary nervous system. Nervous system; Nervous system -- Coelenterata. SPONGES 35 son, Reniera and Lissodendoryx, not only may the pores close by the formation of a pore membrane, but this process may be supplemented by a closure of the pore canal itself. This is probably due, according to Wilson, to a contraction of the epithelial lining in the pore canal acting after the fashion of a sphincter. Thus there ap- pear to be two somewhat independent devices for the closure of the pores, the pore membrane and the pore. Please note that these images are extracted from scanned page images
. The elementary nervous system. Nervous system; Nervous system -- Coelenterata. SPONGES 35 son, Reniera and Lissodendoryx, not only may the pores close by the formation of a pore membrane, but this process may be supplemented by a closure of the pore canal itself. This is probably due, according to Wilson, to a contraction of the epithelial lining in the pore canal acting after the fashion of a sphincter. Thus there ap- pear to be two somewhat independent devices for the closure of the pores, the pore membrane and the pore. 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 Parker, George Howard, 1864-1955. Philadelphia, London J. B. Lippincott Company
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