FIG. 36.--Astacus fluviatilis.--A transverse section through the nineteenth (fifth abdominal) somite ( x 2). e.m., extensor muscle; f.m., flexor muscles; g.n. 12, the fifth abdominal ganglion; h.g., hind-gut; i.a.a., inferior abdominal artery; s.a.a., superior abdominal artery; pl. XIX, pleura of the somite; st. XIX, its sternum; t. XIX, its tergum; ep. XIX, its epimera; 19, its appendage.
[Editor's note: illustration is reproduced here approximately twice the size of the woodcut in the book.]
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