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Biol Bull 122: 228-231. (April 1962)
© 1962 Marine Biological Laboratory
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IONIC BALANCE IN BLOOD AND COELOMIC FLUID OF EARTHWORMS

F. I. KAMEMOTO 1, ALICE E. SPALDING 1, and SHARON M. KEISTER 1

1 Department of Zoology, University of Missouri, Columbia, Missouri

1. The concentrations of sodium, potassium, calcium and chloride in the blood and coelomic fluid were determined in Lumbricus terrestris kept in moist soil, tap water and 0.1 M NaCl solution, and in Helodrilus caliginosus kept in moist soil. Coelomic fluid only was analyzed in Eisenia foetida.

2. The concentrations of cations are higher in the blood than in the coelomic fluid in all groups studied. There is no difference in the concentration of chloride between the blood and coelomic fluid.

3. Ionic concentrations are similar in the three species studied under similar conditions.

4. The concentration of sodium in both blood and coelomic fluid is maintained greater than the medium in 0.1 M NaCl solution.






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