Abstract
The spawning temp. of 12 species of marine lamellibranch molluscs fall close to 5, 10, 15, 20, and 25[degree]C. The critical temp. for beginning of ciliary activity and of shell opening for 3 species are 0, 5, and 10[degree]C. The critical temp. for the initiation of heartbeat in 1 species is 5[degree]C. The bearing of these temp. on the distribution of the molluscs is briefly discussed.

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