FIG. 6--Astacus fluviatilis.-- A longitudinal vertical section of the alimentary canal, with the outline of the body (nat. size):-- a, vent; ag, anterior gastric muscle; bd, entrance of left bile duct; cg, cervical groove; cæ, cæcum; cpv, cardio-pyloric valve; cs, cardiac portion of stomach; the circular area immediately below the end of the line from cs marks the position of the gastrolith of the left side; hg, hind-gut; lb, labrum; lt, lateral tooth of stomach; m, mouth; mg, mid-gut; mt, median tooth; oe, oesophagus; pc, procephalic process; pg, posterior gastric muscle; ps, pyloric portion of stomach; r, annular ridge, marking the commencement of the hind-gut.
[Editor's note: illustration is reproduced here approximately twice the size of the woodcut in the book.]
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