The eye of Gammarus chevreuxi has served several times as an object for genetical observations. We have accordingly thought it useful to undertake a more detailed study of certain quantitative features of its development.

1

We have designed as “slow” any individual which had 14 or less eye facets at hatching; male with the same or lower facet number than an average female of the same age ; and a female whose facet number was at least 15 per cent, below the average.

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