THE MAXILLIPEDES. 165 



with two terminal divisions (ip to dp, and ex), which are 

 directed forwards, below the mouth, and a third, lateral 

 appendage {e, hr), which runs up, beneath the carapace, 

 into the branchial chamber. The latter is the gill, or podo- 

 branchia, attached to this limb, and it is something not 

 represented in the abdominal limbs. But, with regard 

 to the rest of the maxillipede, it is obvious that the 

 basal portion {cxp, bp) represents the protopodite, and 

 the two terminal divisions the endopodite and the exo- 

 podite respectively, j It has been observed that, in the 

 abdominal appendages, the extent to which segmentation 

 occurs in homologous parts varies indefinitely ; an endo- 

 podite, for example, ma}^ be a continuous plate, or may 

 be subdivided into many joints. In the maxillipede, the 

 basal portion is divided into two joints ; and, as in the 

 abdominal limb, the first, or that which articulates with 

 the thorax, is termed the coxopodlte (cxp), while the second 

 is the hasipodlte (hp). The stout, leg-like endopodite 

 appears to be the direct continuation of the basipodite ; 

 while the much more narrow and slender exopodite arti- 

 culates with its outer side. \_The exopodite (ex) is by no 

 means unliive one of the exopodites of the abdominal 

 limbs, consisting as it does of an undivided base and a 

 many-jointed terminal filament. /^The endojjodite, on the 

 contrar}^, is strong and massive, and is divided into five 

 joints, named, from that nearest to the base onwards, 

 ischiopodite (ip), meropodite [pip>), carpopodite (cp), propo- 

 dite (pi>), and dactylopodite (f?iO«^ 



