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Quarterly Journal of Microscopical Science, Vol s3-92, 307-321, Copyright © 1951 by Company of Biologists

The Activity of Amoebocytes and of Alkaline Phosphatases during the Regeneration of the Shell in the Snail, Helix aspersa

L. E. WAGGE PH.D.1

1 King's College, London, and the Zoology Department, Imperial College of Science and Technology, University of London

Experiments show that in Helix aspera amoebocytes repair a damaged shell after transporting calcium carbonate and proteins from other parts of the shell, or from the digestive gland. The mantle is firmly applied to the damaged area and over itexudes fluid rich in amoebocytes. These secrete, and rapidly calcify, a protein membrane. Similar additional calcified membranes give firm protection after 24 hours.

The shell serves as a reservoir of calcium and protein, invaluable to a terrestrial gastropod. Amoebocytes can carry calcium back to the body. Extensive shell damage is repairable provided enough reserves remain: a snail cannot rebuild an entirely new shell. Thickening occurs whenever calcium and protein are available. Shell growth, however, initiated by the secretion of the periostracum, exclusively formed by the mantle skirt, happens only in conjunction with body growth.

Provided feeding activities are normal, alkaline phosphatases are abundant during shell repair, especially around digestive gland lime cells. Shell repair and digestion are closely associated. Amoebocytes, ineffective in an active, starved snail, can repeatedly repair damaged shell when a snail feeds, if only on filter paper: for once stimulated ample calcium and proteins are available for them in the shell.






© The Company of Biologists Ltd 1951