pdb.s 



pd6.!3 



«r7>.8 arb.9 plh.\2 arb.\3 pi6.l3 



— * * —^ 1 — ^m£L 



am 



Fig. 4.— Jsfeicus ^M-yw/iUs. — In A, the gills, exposed by the removal of the brancbio- 

 stegite, are seen in their natural position ; in B, the podobranchise (see p. 75) are re- 

 moved, and the anterior set of arthrobranehiae turned downwards ( x 2) : 1, eye-stalk ; 

 2, antennule ; 3, antenna ; h, 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 ; Ik, fourth ambulatory leg ; 15, first abdominal 

 appendage; xv., first, and xvi., second abdominal somite; orb. 8, arb. 9, arb. IS, 

 the posterior arthrobranehiae of the second and third maxillipedes and of the third 

 ambulatory leg ; arb'. 9, arb'. 13, the anterior arthrobranehiae of the third maxillipede 

 and of the third ambulatory leg ; pbd. 8, podobranchise of the second maxillipede ; 

 pbd. IS, that of the third ambulatory leg ; plb. 12, pU>. IS, the two rudimentary 

 pleurobranchiai ; -plb. Ik, the functional pleurobranchia ; r, rostrum. 



