FIG. 16.--Astacus fluviatilis.--The heart ( x 4). A, from above; B, from below; C, from the left side. aa, antennary artery; ac, alae cordis, or fibrous bands connecting the heart with the walls of the pericardial sinus; b, bulbous dilatation at the origin of the sternal artery; ha, hepatic artery; la, lateral valvular apertures; s.a.a., superior abdominal artery; st. a, sternal artery, in B cut off close to its origin.
[Editor's note: illustration is reproduced here approximately twice the size of the woodcut in the book.]
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