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, hp) represents the protopodite, and 

 the two terminal divisions the endopodite and the exo- 

 podite respectively. 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, may 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 basipodite (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 unliKe one of the exopodites of the abdominal 

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

 many -jointed terminal filament. The endopodite, on the 

 contrary, is strong and massive, and is divided into five 

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

 ischiopodite (ip), meropodite (inp), carpopodite {cp), propo- 

 dite {p2>), and dacti/lopodlte (dp). 



