FIG. 42.--Astacus fluviatilis.--A segment of the endophragmal system ( x 3). aph, arthrophragm; arth, arthrodial or articular cavity; cxp, coxopodite of the ambulatory leg; enpl, endopleurite; ens, endosternite; epm, epimeron; hp, horizontal process of endopleurite; mph, mesophragm; pph, paraphragm; s, sternum of somite; sc, sternal canal.
[Editor's note: illustration is reproduced here approximately twice the size of the woodcut in the book.]
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