THE CRUSTACEA 



Fio. 23. 



Trunk-limbs of various Branchiopoda. A, seventh trunk-limb of -ly/* n/,ir, ;/,,//;.< 

 (Xotostraca). B, third trunk-limb of Esthcria obliqua t'Conchostraca). C, fifth trunk-limb of 

 Branchinei-ta paUidosn (Anostraca). D, eleventh trunk -limb of Polyortemia forcipata 

 (Anostraca). (A after Lankester ; B, C, and D after Sars.) br, branchia or bract ; fl, 

 tlabellum ; /, tactile process of the fifth endite in Estheria ; x, proximal exites of the Anostraca ; 

 1-6, the six endites, of which the first is the gnathobase. Between the flabellum and the 

 sixth endite in A is seen the " sub-apical lobe." Regarding the homology of the plate lettered 

 fl in C and D, see the discussion in the text. 



