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Quarterly Journal of Microscopical Science, Vol s3-91, 419-428, Copyright © 1950 by Company of Biologists

The Mesoglea and Muscle-fibres of Chlorohydra viridissima

WILLIAM HOLMES 1

1 Department of Zoology and Comparative Anatomy, University Museum, Oxford

The structure and relations of the mesoglea, muscle-fibres, and cell layers were examined by several histological techniques.

Evidence is given that the muscle-fibres represent specializations of the mesogleal substance, and they are therefore referred to as mesogleal fibres.

The longitudinal fibrous system is regularly demonstrable in the body of the animal and the circular system in its tentacles. The circular system in the body cannot regularly be shown and is variable in its appearance.

The evidence from the study of the fibres, and of the mesoglea of the pedal disk, leads to the suggestion that some at least of the fibres are labile structures, ‘crystallizing’ from the mesoglea according to the shape and movements of the animal.






© The Company of Biologists Ltd 1950