lO 



CRUSTACEA 



maxillipedes of masticatory functions. Thus in the Decapoda 

 the first maxillipede is decidedly foliaceous owing to the expanded 



Fig. 1. — Appendages of Crustacea (A-G) and Triloliita (H). A, First maxillipede of 

 Astacus : B, second maxilla of Jstanis ; C, second walking-leg of Astaciis ; D 

 thoracic limb of Branchipits ; E, first maxillipede of Mysis ; F, first maxillipede of 

 Gnathophaiism ; G, thoracic linil^ of NehaUn ; H, thoracic limb of Triarthrns, 

 bp, Basipodite ; br, Ijract ; cj}, carpopodite ; c.q), coxopodite ; cx.s, coxopoditic 

 setae ; rfy, dactylopodite ; end, endopodite ; ep, epipodite ; e-x, exopodite ; yj, 

 ischio]iodite ; vip, meroi^odite ; 2^2^> propodite ; 1-6, the six endites. 



" gnathobases " (Fig. 1, A, Iqj, cx'ji), and the second maxilli- 

 pedes are flattened, with their basal joints somewhat expanded 

 and furnished with biting hairs ; but in the " Schizopoda " 



