FIG. 10.--Astacus fluviatilis.--Longitudinal section of the stomach (x 4), c, cardiac ossicle, cae, caecum; c.p.v., cardio-pyloric valve; cs, cushion-shaped surface; hg, hind-gut; hp, aperture of right bile duct; lp, lateral pouch; lt, lateral teeth; mg, mid-gut; mt, median tooth; oes, oesophagus; p, pyloric ossicle; pc, pterocardiac ossicles; pp, perpyloric ossicle; uc, urocardiac process; v1, median pyloric valve; v2 , lateral pyloric valve; x, position of gastrolith; zc, zygocardiac ossicle.
[Editor's note: illustration is reproduced here approximately twice the size of the woodcut in the book.]
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