FIG. 35.--Astacus fluviatilis.--The last thoracic sternum, seen from behind, with the proximal ends of the appendages, A, in the male, B, in the female, ( x 3). am, articular membrane; cxp, coxopodite; st XIV, last thoracic sternum, vd, aperture of vas deferens.
[Editor's note: illustration is reproduced here approximately twice the size of the woodcut in the book.]
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