It is now understood that they are Euthyneurous Gastropods adapted to natatory locomotion and pelagic life. [Please select]
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A proof of his natatory powers is found in the fact that Arctic voyagers have observed him swimming about in the open sea full twenty miles from the nearest land. [Please select]
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Under the head of the closely-allied _Ibla quadrivalvis_, we shall, moreover, see that the males are developed from larvæ, having every point of structure--the peculiar quasi-bivalve shell, the two compound eyes, the six natatory legs, &c. [Please select]
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