. Animal physiology. Physiology, Comparative; Physiology, Comparative. Fig. 144.—Tritonia. Fig. 145.—Glaucus. in a circle around the end of the intestine, as in the Doris (see also Fig. 133) ; and are sometimes covered in, more or less completely, by a fold of the mantle. Tn most of the species that possess shells, the gills form comb-like fringes, which are lodged in a cavity enclosed in the last turn of the spiral shell; and to this cavity the water is admitted, sometimes by a large open- ing, sometimes by a prolonged tube. In the Cephalopoda, we find the gills composed of a collection of li
. Animal physiology. Physiology, Comparative; Physiology, Comparative. Fig. 144.—Tritonia. Fig. 145.—Glaucus. in a circle around the end of the intestine, as in the Doris (see also Fig. 133) ; and are sometimes covered in, more or less completely, by a fold of the mantle. Tn most of the species that possess shells, the gills form comb-like fringes, which are lodged in a cavity enclosed in the last turn of the spiral shell; and to this cavity the water is admitted, sometimes by a large open- ing, sometimes by a prolonged tube. In the Cephalopoda, we find the gills composed of a collection of little leaf-like folds, placed on a stalk (5r, 6r, Fig. 134) ; they are enclosed in a cavity which is covered in by the mantle ; and the walls of this cavity have the power of alternately dilating. Fig. 146.— 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 Carpenter, William Benjamin, 1813-1885. London : Wm. S. Orr and Co.
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