FIG. 43.--Astacus fluviatilis.--Longitudinal section of the anterior part of the cephalothorax ( x 3). I--IX, sterna of first nine cephalothoracic somites; 1, eyestalk; 2, basal joint of antennule; 3, basal joint of antenna; 4, mandible; a, inner division of the masticatory surface of the mandible; a', apophysis of the mandible for muscular attachment; cp, free edge of carapace; e, endosternite; enpl, endopleurite; epm, epimeral plate; l, labrum; m, muscular fibres connecting epimera with interior of carapace; mt, metastoma; pcp, procephalic process.
[Editor's note: illustration is reproduced here approximately twice the size of the woodcut in the book.]
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