FIG. 68. Podobranchiæ of A, Parastacus; B,Nephrops; C, Palæmon. A', C', transverse sections of A and C respectively.a, point of attachment;al, wing-like expansion of the stem;b, base; br, branchial filaments;ep, epipodite;l, branchial laminæ; pl, plume;st, stem.
[Editor's note: illustration is reproduced here approximately twice the size of the woodcut in the book.]
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