74 



THE PALPI OF FRESH-WATfiR MITES. 



observe, the organ being very simple. It will be seen that the 



second and fourth joints are the longest, and the fifth claw-shaped. 



In Fig. 14 we have not much difference; the second joint is, 



however, very much broader and flattened, and the fourth narrower. 



:^^^/ii^ 



o 



In Fig. 15 and Fig. 16 the fourth joint is differently formed, 

 being much broader, and having one angle lengthened, so as to 

 form with the very movable fifth joint a pair of forceps, reminding 

 one of the large claw of a crab, or the beak of a parrot. 



In Fig. 17 we find a very large and curious process growing 

 from the outside of the fourth joint. 



In Fig. 18, Ilydrochoj-eutcs, we have the fourth joint elongated 

 so much that it is longer than the second and third joints together. 

 In this figure and Fig. 19, Ncsea^ the first joint is not represented. 

 In this last there is also a projection on the outside of the fourth 

 joint. This, however, is not present in all species of Nesea, and 



