. Animal and vegetable physiology, considered with reference to natural theology, by Peter Mark Roget ... Biology; Physiology; Plant physiology; Natural theology. NUTRITION IN THE ACTINIA. 99 step higher in the scale, we find that the stomach and intestinal tube, together with their appen- dages, are distinct organs, formed by membranes and coats proper to each, and that they are themselves contained in an outer cavity, which surrounds them, and which receives and collects the nutritious juices after their elaboration in these organs. The Actinia, or Sea Anemone, for example, resembles a polyp
. Animal and vegetable physiology, considered with reference to natural theology, by Peter Mark Roget ... Biology; Physiology; Plant physiology; Natural theology. NUTRITION IN THE ACTINIA. 99 step higher in the scale, we find that the stomach and intestinal tube, together with their appen- dages, are distinct organs, formed by membranes and coats proper to each, and that they are themselves contained in an outer cavity, which surrounds them, and which receives and collects the nutritious juices after their elaboration in these organs. The Actinia, or Sea Anemone, for example, resembles a polypus in its general form, having a mouth, which is surrounded with tentacula, and which leads into a capacious stomach, or sac, open below, and occupying the greater part of the bulk of the animal; but while, in the polypus, the sides of the stomach constitute also those of the body, the whole being one simple sac ; in the actinia, spaces inter- vene between the coats of the stomach, and the skin of the animal. As the stomach is not a closed sac, but is open below, these cavities are, in fact, continuous with that of the stomach : they are divided by numerous membranous partitions passing vertically between the skin, and the membrane of the stomach, and giving support to that organ. Fig. 257, repre- senting a vertical section of the Actinia coriacea, displays this internal structure, b is the base. 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 Roget, Peter Mark, 1779-1869. London : W. Pickering
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