The observations were made on the Hunterston Sands, Ayrshire, opposite the Cumbrae. 2. Small cockles appear on the ground about the beginning of August. This points to the breeding season being in summer and not spring, as is usually stated. 3. By the end of the first autumn some few of the spat are as much as 10 mm. in length, but most are under 6 mm. The winter ring is faint and easily overlooked. 4. The first of the several well-defined rings is therefore not the first but the second winter ring.
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A. C. Stephen (1931) studied this question.