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Updated: May 25, 2025
Any one who takes the trouble to make himself acquainted with the facts will see that the three chief features of the Pleuronectid namely, the position of the eyes, the extension of the dorsal and ventral fins, and the absence of pigment from the lower side are not structurally correlated with one another at all as changes in different parts of the organism in a mutation are said to be, but are all closely related to their functions in the new position of the body.
A mutation consisting in general asymmetry would be comprehensible, but the head of the Pleuronectid is not asymmetrical in a general sense, but only so far as to allow of the changed position of the eyes. The posterior end of the skull is as symmetrical as in any other fish, and in some cases the mouth and jaws are also symmetrical, entirely unaffected by the change in the position of the eyes.
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