THE ELECTROCARDIOGRAM OF ARENICOLA

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Abstract
The ecg. of A. cristata is compared with records from Limulus, Libinia, Loligo and Amblema. The ecg. of Arenicola consists of a rapid negative deflection followed by a positive deflection often with superimposed oscillations and often followed by a slow negative wave. There is much variability from animal to animal and from time to time at the same position. The oscillatory nature of the ecg. supports the hypothesis that the heart of Arenicola is neurogenic.

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