FIG. 54.--Astacus fluviatilis.--A, one of the (double) abdominal ganglia, with the nerves connected with it ( x 25); B, a nerve cell or ganglionic corpuscle ( x 250). a, sheath of the nerves; c, sheath of the ganglion; co, co'. commissural cords connecting the ganglia with those in front, and those behind them. gl.c. points to the ganglionic corpuscles of the ganglia; n, nerve fibres.
[Editor's note: illustration is reproduced here approximately twice the size of the woodcut in the book.]
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