FIG. 53.--Astacus fluviatilis.--A, living muscular fibres very highly magnified; B, a fibrilla treated with solution of sodium chloride; C, a fibrilla treated with strong nitric acid. s, septal lines; sz, septal zones; is, interseptal zones; a, transverse line in the interseptal zone.
[Editor's note: illustration is reproduced here approximately twice the size of the woodcut in the book.]
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