FIG. 18.--Astacus fluviatilis.--A, the anterior part of the body, with the dorsal portion of the carapace removed to show the position of the green glands; B, the same, with the left side of the carapace removed; C, the green gland removed from the body (all x 2). ag, left anterior gastric muscle; c, circumoesophageal commissures; cs, cardiac portion of stomatch; gg, green gland, exposed in A on the left side by the removal of its sac; ima, intermaxillary or cepalic apodeme; oes, oesophagus seen in transverse section in A, the stomach being removed; s, sac of green gland; x, bristle passed from the aperture in the basal joint of the antenna into the sac.
[Editor's note: illustration is reproduced here approximately twice the size of the woodcut in the book.]
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