Heart of the Mollusca

Diagram to show the relations of the heart in the Mollusca (From Gegenbaur.) A, Part of the dorsal vascular trunk and transverse trunks of a worm. B, Ventricle and airicles of Nautilus. C, Of a Lamellibranch, of Chiton, or of Liligo. D, Of Octopus. E, Of a Gastropod. a, Auricle. v, Ventricle. ac, Arteria=cephalica=(aorta). ai, Arteria abdominalis. The arrows show the direction of the blood-current.
Source: 1911 Encyclopedia Britannica, Vol. 5, p. 691

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