FIG. 13.--Astacus fluviatilis.--The alimentary canal and livers seen from above (nat. size). bd, bile-duct; cae, caecum; cs, cardiac portion of stomach, the line pointing to the cardiac ossicle; hg, hind-gut; mg, mid-gut; pc, pterocardiac ossicle; ps, pyloric portion of stomach, the line pointing to the pyloric ossicle; r, ridge separating mid-gut from hind-gut; zc, zygocardiac ossicle.
[Editor's note: illustration is reproduced here approximately twice the size of the woodcut in the book.]
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