Measurement of Crabs

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IN his letter of December 3, Mr. Cunningham suggests that if the young crabs be compared so that the frontal ratio is taken as the standard of comparison between the respective groups of the two years, the difference will be one of carapace length only, and this may be due to variation in the food supply. But he does not explain why the effect of the supposed variation in the food supply should be confined to the one dimension of carapace length, and not extend to the frontal ratio also. There is no evidence to lead us to suppose that the change of frontal ratio is a more accurate criterion of development than carapace length; but whichever be taken as a basis for comparison, the result is a change of shape in the carapace as between the two years.

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THOMPSON, H. Measurement of Crabs. Nature 55, 224 (1897) doi:10.1038/055224b0

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