154 



THE CRUSTACEA 



In N'ebaliopsis, however, the endopodite is a short lobe and the 

 exopodite is hardly indicated. 



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

 Nebalio2)sis, and they present considerahle differences of structnre 

 in the four genera. 



In Nehalia (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 



en. — ^ 



Fig. S9. 

 First thoracic limb of Nehalia. en, endopodite ; ep, epipodite ; rx, exopodite. 



(After Claus.) 



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 (««) 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 the basipodite and 

 ischiopodite, all the segments of the typical raalacostracan leg can 

 be distinguished. In Ahhaliella (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 



