FIG. 62.--A & D, Astacus torrentium; B & E, A. nobilis; C & F, A. nigrescens. A-C, 1st abdominal appendage of the male; D-F, endopodite of second appendage ( x 3). a, anterior, and b, posterior rolled edge; c, d, e, corresponding parts of the appendages in each species; f, rolled plate of endopodite; g, terminal division of endopodite.
[Editor's note: illustration is reproduced here approximately twice the size of the woodcut in the book.]
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