Abstract
FIGS. 1 and 2 reproduce photographs of a model demonstrating a type of skeletal movement which depends upon automatic adjustments of hydrostatic pressure acting upon an elastic body wall. Neither muscular nor nervous mechanism is demanded. These skeletal movements, according to investigations I have made recently, appear to have characterised some of the Cambrian Cystoidea—the earliest and most primitive of all the Echinodermata. The automatic adjustments of body wall and skeleton, it is suggested, were brought about by varying ciliary activity during the rise and fall of the tide.
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” Ciliary Mechanisms”
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SPENCER, W. A New Type of Skeletal Movement. Nature 136, 679 (1935). https://doi.org/10.1038/136679a0
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DOI: https://doi.org/10.1038/136679a0
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