FIG. 26.--Astacus fluviatilis.--A, the right antennule seen from the inner side ( x 5); B, a portion of the exopodite enlarged; C, olfactory appendage of the exopodite; a, front view; b, side view ( x 300); a olfactory appendages, au, auditory sace, supposed to be seen through the wall of the basal joint of the antennule; setae; en, endopodite; ex, exopodite; sp, spine of the basal joint.
[Editor's note: illustration is reproduced here approximately twice the size of the woodcut in the book.]
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