Fig. 4 



Organs of attachment in three differeni 

 groups of internal parasites 



(i) Proboscis of tongue-worm, Reig- 

 hardia sternae (x 5.5) from air sacs of 

 a tern, (after Heymons) ; (2) Suckers 

 and hooks of a duck tapeworm, 

 Hvmenolepis macracanthos (x 133), 

 (after Fuhrmann) ; (3) Proboscis of 

 spiny-headed worm, Corynosoma turbi- 

 dum (x 106) from a cormorant (after 

 Van Cleave) 



(0 



