. Comparative animal physiology. Physiology, Comparative; Physiology, Comparative. 30 Comparative Animal Physiology Chloride concentrations in blood and urine, recalculated into millimols per liter by Krogh, are as follows: Blood Cl~ Urine Cl~ mM/1. mM/1. Astaciis fluviatilis--^ 195 10 Astacus fluviatilis'"' 196 Camharus clarkii^^'^ 117 This difference suggests either that salt is reabsorbed into the blood or that water is secreted by the kidney. In Eriocheir in fresh water certain substances 4 Nephridial canal 3 a Labyrinth 5 Nephridial canal 2 Nephrostome. 36 Labyrinth 5 Nephri
. Comparative animal physiology. Physiology, Comparative; Physiology, Comparative. 30 Comparative Animal Physiology Chloride concentrations in blood and urine, recalculated into millimols per liter by Krogh, are as follows: Blood Cl~ Urine Cl~ mM/1. mM/1. Astaciis fluviatilis--^ 195 10 Astacus fluviatilis'"' 196 Camharus clarkii^^'^ 117 This difference suggests either that salt is reabsorbed into the blood or that water is secreted by the kidney. In Eriocheir in fresh water certain substances 4 Nephridial canal 3 a Labyrinth 5 Nephridial canal 2 Nephrostome. 36 Labyrinth 5 Nephridial canal I Coeloraic sac 1 mm. 6 Urinary bladder Fig. 16. Cross section of the kidney of a crayfish, consisting of a much coiled but con- tinuous tube with coelomic sac, labyrinth, nephridial canal, and bladder. From ;'* such as magnesium are much less concentrated in the urine than in the blood, but chloride content is similar in each fluid, whereas in the crayfish all of the urine salts are lower in concentration than are the blood salts. I he crayfish kidney consists first of a coelomic sac penetrated by blood vessels and sinuses and lined by a single epithelial layer (Fig. 16). Then fohows the green tubular labyrinth, a sponge-like structure, and a long (3 cm.) nephridial canal. The canal empties into the urinary bladder. The blood supply is rich to all parts except the bladder. The blood vessels open into hcm(Koelc spaces which surround the kidney tubules. In the lobster, which excretes an isotonic urine, the labyrinth tubule is larger, but the nephridial canal is not well differentiated. ^'-^^ The nephridial tubule in the fresh-water. 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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