FIG. 38.--Astacus fluviatilis.--The mode of connexion between the last thoracic and the first abdominal somites ( x 3). a, L-shaped bar; cpe, carapace; cxp. 14, coxopodite of the last ambulatory leg; plb., place of attachment of the pleurobranchia; st. XV, sternum, and t. XV, tergum of the first abdominal somite.
[Editor's note: illustration is reproduced here approximately twice the size of the woodcut in the book.]
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