FIG. 4--Astacus fluviatilis.-- In A, the gills, exposed by the removal of the branchiostegite, are seen in their natural position; in B, the podobranchiæ (see p. 75) are removed, and the anterior set of arthrobranchiæ turned downwards (x2): 1, eye-stalk; 2, antennule; 3, antenna; 4, mandible; 6, scaphognathite; 7, first maxillipede, in B the epipodite, to which the line points, is partly removed; 8, second maxillipede; 9, third maxillipede; 10, forceps; 14, fourth ambulatory leg; 15, first abdominal appendage; XV, first, and XVI, second abdominal somite; arb. 8, arb. 9, arb. 13, the posterior arthrobranchiæ of the second and third maxillipededs and of the third ambulatory leg; arb'. 13, the anterior arthrobranchiæ of the third maxillipede and of the third ambulatory leg; pbd. 8, podobranchiæ of the second maxillipede; pbd. 13, that of the third ambulatory leg; plb. 12, plb. 13, the two rudimentary pleurobranchiæ; plb. 14, the functional pleurobranchia; r, rostrum.
[Editor's note: original printed illustration was about 2.5in (6.5cm) vertical by 3.5in (9cm) horizontal.]
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