Abstract
1. 1. Heart and scaphognathite rates of two decapod crustaceans Cancer borealis and C. irroratus were measured under declining oxygen conditions. 2. 2. Heart rate was monitored by an external impedance electrode technique preventing injury to the animal. 3. 3. The heart and scaphognathites show a similar regulatory response to diminishing oxygen conditions. 4. 4. The relationship between frequency modulation of the respiratory rates and the existence of a central coordinating system between heart and gill-bailers is being pursued.
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