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FromThe Crayfish, by T. H. Huxley, 1879

Figure 19

fig. 19

FIG. 19.--Astacus fluviatilis.--A, a single fibre; transverse diameter 1/110th of an inch; B, a portion of the same more highly magnified; C, a smaller portion still more highly magnified; D and E, the splitting up of a part of fibre into fibrillæ; F, the connexion of a nervous with a muscular fibre which has been treated with acetic acid. a, darker, and b, clearer portions of the fibrillæ; n, nucleus of sarclomma; nv, nerve fibre; s, sarcolemma; t, tendon; 1--5, successive dark bands answering to the darker portions, a, of each fibrilla.

[Editor's note: illustration is reproduced here approximately twice the size of the woodcut in the book.]

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