Attaching Disc. The main attaching apparatus which is used 

 for the fixation of the animal to the body of its host is a complexly arranged 

 system of attachment organs lying on the posterior end of the body, which 



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sometimes extends for a considerable distance anteriorly. This system 

 consists of the adhesive disc and of the different attaching organs located 

 thereon (Fig. 25). The adhesive disc varies in its structure in a series of 

 cases, also in its origin. We can distinguish discs weakly or strongly 

 delineated from the rest of the body and, finally, prinaary and secondary 



15 



