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Quarterly Journal of Microscopical Science, Vol s3-91, 225-235, Copyright © 1950 by Company of Biologists

Observations on the Ligament of Mytilus edulis

E. R. TRUEMAN 1

1 Department of Zoology, University College, Hull

1. The ligament of Mytilus edulis is situated between the valves of the shell immediately below the dorsal margin and may be divided into two main layers, the inner and the outer, the principal features of which appear to correspond with those of other bivalves.

2. The outer layer is subjected to a tensile strain transverse to the longitudinal plane of the shell, which is imposed by the addition of the inner layer. This strain is increased when the valves are closed. At the same time the inner layer is compressed. It is significant, however, that the birefringence of the main outer layer is much smaller than-in Tellina.

3. The prodissoconch has a small internal ligament which is replaced by the normal adult structure as the posterior dorsal margin of the young mussel is extended.

4. The axis about which the valves open is situated along a line drawn between the two main layers. Anteriorly the adult ligament becomes split and ceases to function. Possible explanations are suggested.






© The Company of Biologists Ltd 1950