FIG. 48.--Astacus fluviatilis.--A, eye-stalk; B, antennule; C, antenna of the left side ( x 3). a, spine of the basal joint of the antennule; c, corneal surface of the eye; exp, exopodite or squame of the antenna; gg, aperture of the duct of the green gland.
[Editor's note: illustration is reproduced here approximately twice the size of the woodcut in the book.]
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