FIG. 20.--Astacus fluviatilis.--The chela of the forceps, with one side cut away to show, in A, the muscles, in B, the tendons ( x 2). cp, carpopodite; prp, propodite; dp, dactylopodite; m, adductor muscle; m', abductor muscle; t, tendon of adductor muscle; t', tendon of abductor muscle; x, hinge.
[Editor's note: illustration is reproduced here approximately twice the size of the woodcut in the book.]
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