. Comparative animal physiology. Physiology, Comparative; Physiology, Comparative. 12 Comparative Ayiimal Physiology salt movement. Under ordinary conditions, then. Phascolosoma behaves like an osmometer and shows no volume regulation. It is probable that Sipimculns behaves similarly. â ^â¢' 50X sw. ^-^VAV 36 "4 8 HOURS Fig. 4. Percentage change in volume of four molluscs when transferred at zero hours to the dilutions of sea water indicated. Ouchidium changed from 10 per cent to 50 per cent sea water and Aplysia from 75 per cent to 100 per cent sea water at time indicated by arrows. Two
. Comparative animal physiology. Physiology, Comparative; Physiology, Comparative. 12 Comparative Ayiimal Physiology salt movement. Under ordinary conditions, then. Phascolosoma behaves like an osmometer and shows no volume regulation. It is probable that Sipimculns behaves similarly. â ^â¢' 50X sw. ^-^VAV 36 "4 8 HOURS Fig. 4. Percentage change in volume of four molluscs when transferred at zero hours to the dilutions of sea water indicated. Ouchidium changed from 10 per cent to 50 per cent sea water and Aplysia from 75 per cent to 100 per cent sea water at time indicated by arrows. Two patterns of response of Aplysia are shown. Ouchidium data from Dakin and Edmonds," Doris and Aplysia data from Bcthe,''" Mytilus from Maloeuf.'"" The polychaetes, Arenicola marina, Nereis pelaoica, and Nereis cidtrifera, show osmotic lability and some swelling in dilute media. The following data -^â¢* (also Fig. 6) show that Arenicola adjusts in osmoconcentration to its medium both in its natural habitat and in the laboratory: Ao Ai Habitat experimental Kiel Canal Helgoland Thus Arenicola must be able to sur\ive considerable dilution of its tissues. The sodium chloride content of the blood of both Sipuncitlus and Arenicola is nearly the same as that of sea water, and since both organisms are isotonic with the ocean the organic solutes must be \ery dilute. "- Several molluscs also show little or no volume regulation (Fig. 4). The nudibranch Doris swells rapidly in a dilute medium, and remains swollen for. 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 Prosser, C. Ladd (Clifford Ladd), 1907-; Bishop, David W. Philadelphia, Saunders
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