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Quarterly Journal of Microscopical Science, Vol s3-103, 549-555, Copyright © 1962 by Company of Biologists

The Structure of the Dragline Control Valves in the Garden Spider

R. S. WILSON 1

1 Department of Zoology, University of Bristol

In the ducts of the major and minor ampullaceal glands of Araneus diadematus, special valves have been found which control the output of the dragline. Closure of the duct is achieved by inflation of the valve lips; opening is achieved by deflation. These valvular changes are brought about by groups of muscles attached to the duct.






© The Company of Biologists Ltd 1962