The Mesogloea of Pelagia noctiluca

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Abstract
The arrangement of the mesogloea fibres of Pelagia noctiluca is described chiefly from material examined in the fresh state. The role of the mesogloea in swimming is shown to be the antagonization of the subumbrellar circumferential muscles. The fibres of the mesogloea are shown to be collagenous by their contraction on heating, their amino-acid composition, and their appearance under the electron microscope. A suggestion is made to account for the characteristic arrangement of the fibres at a distance from the cellular layers.

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