Abstract
IN his review of Dr. de Beer's “Embryology and Evolution” (June 14, p. 883), Prof. MacBride appeals to readers of NATURE to decide between two theories of the origin of asymmetry in Gastropods. He supports the opinion that the weight of the shell stretched one side of the animal and crushed the other, thus initiating an inequality of growth. On the alternative view “a sudden and miraculous mutation” twisted the visceral hump and shell through 180°.
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References
Bridges and Morgan : Carnegie Inst. Pub. 327.
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HALDANE, J. Origin of Asymmetry in Gastropods. Nature 126, 10–11 (1930). https://doi.org/10.1038/126010a0
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DOI: https://doi.org/10.1038/126010a0
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