FIG. 33.--Astacus fluviatilis.--A, a lobule of the testis, showing a, acini, springing from b, the ultimate termination of a duct ( x 50). B, spermatic cells a, with an ordinary globular nucleus n; b, with a spindle-shaped nucleus; c, with two similar nuclei; and d, with a nucleus undergoing division ( x 600).
[Editor's note: illustration is reproduced here approximately twice the size of the woodcut in the book.]
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