Abstract
1. 1. A daily rhythm of oxygen consumption was demonstrated in the salt marsh periwinkle. Littorina irrorata. Snails maintained on a 12L:12D photoperiod had highly significant increased respiration rates during the dark phase for 6 days. 2. 2. The respiration rhythm was found to persist in constant darkness for at least 50 hr but not for 6 days. 3. 3. The oxygen consumption rhythm was entrained to an inverted photoperiod of 12D:12L after 64 hr exposure to the new photoperiod. Higher respiration rates still occurred during the dark phase. 4. 4. A decrease of both magnitude and amplitude of the respiration rhythm occurred with time.
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