FIG. 47.--Astacus fluviatilis.--A, mandible; B, first maxilla; C, second maxilla of the left side ( x 3); ar, internal and ar', external articular process of the mandible; bp, basipodite; cxp, coxopodite; en, endopodite; p, palp of the mandible; sg, scaphognathite; x, internal process of the first maxilla.
[Editor's note: illustration is reproduced here approximately twice the size of the woodcut in the book.]
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