234 FLEAS, FLUKES AND CUCKOOS 



argue that they represent degenerate parapodia of the polychaete type. 

 In many cases when the adult parasite has been modified beyond 

 recognition and reduced to a paUid worm-hke organism, the larvae 

 provide the answer and prove they are cirripedes, copepods or molluscs 

 as the case may be. But in this instance the larvae, like the adults, have 

 suffered such a profound change that their present structure merely 

 presents a series of unanswerable conundrums, which have so far kept 

 the zoologists guessing. 



Female tick, Aponomma sp. (x 8) 

 with parasitic male attached. 



