154 



THE CRUSTACEA 



In Nebaliopsis, however, the endopodite is a short lobe and the 

 exopodite is hardly indicated. 



The eight pairs of thoracic limbs are all similar, except in 

 Nebaliopsis, and they present considerable differences of structure 

 in the four genera. 



In Nebalia (Fig. 89) the whole limb is much flattened. The 

 broad coxopodite and basipodite are distinctly separated, and on 

 the proximal side of the former Hansen has detected a small 

 pre-coxal segment. To the outer margin of the coxopodite is 

 attached the broad lamellar epipodite (ep), obscurely divided into 



FIG. 89. 

 First thoracic limb of Ncbalid. en, endopodite ; ep, epipodite ; ex, exopodite. (After Clans.) 



a proximal and a distal lobe by a slight notch on the outer margin 

 opposite the point of attachment. The basipodite bears externally 

 the oval flattened exopodite (ex) and is continued without any 

 distinct line of articulation into the narrower endopodite (en). 

 From the distal end of the endopodite three, or, in the case of 

 the eighth pair, four segments are marked off, so that, except 

 for the absence of an articulation between tlie basipodite and 

 ischiopodite, all the segments of the typical malacostracan leg can 

 be distinguished. In NebalieUa (Fig. 90, B) the epipodite is absent, 

 the exopodite has more numerous marginal setae, and the articula- 

 tion between the basipodite and ischiopodite -is more distinctly 



