THE CRAYFISH 



121 



that the exopodite is relatively larger, and in the endopodite it 

 is the meropodite which is the longest joint, not the ischio- 

 podite. In the first maxilliped the same essential structures 



Fig. 27 



VIII. Third maxilliped of the right side, seen from behind, cx.p, coxopodite; 

 b.p, basipodite ; ex.p, exopodite ; en.p, endopodite; /./, ischiopodite ; ;./, mero- 

 podite ; c.p, carpopodite ; /./, propodite ; d.p, dactylopodite ; e.p, epipodite bear- 

 ing branchial filaments ; s, coxopoditic setae. VII. Second maxilliped ; lettering 

 as in VIII. VI. First maxilliped. e.p, the membranous epipodite. V. The 

 second maxilla. / and 2, the two lobes of the coxopodite ; 3, 4, the two lobes of 

 the basipodite ; 5, the endopodite ; 6, the exopodite. (These figures should be 

 compared with the similar numerals on the abdominal limb of Apus, fig. 22.) 

 scp, scaphognathite. IV. The first maxilla. ///. The mandible with its palp. 



can be distinguished, but the proportions and relative size of 

 the parts are very much altered. The coxopodite and basi- 



