210 



THE ROUND WORMS. 



intermuscular connective tissue, especially of the lower extremity. 

 The mouth is terminal and the body uniformly cylindrical. The 

 uterus is a continuous tube filled with sharp-tailed, transversely 

 striated embryos, 650 x 17/4 and constitutes the greater part of the body, 

 the alimentary canal being pressed to one side. The genital organs 



13. 



/-OB. 



FIG. 65. Round worms (Filariidae). i, Hooked posterior extremity and anterior 

 extremity of Dracunculus medinensis; 2, cross section of uterus filled with embryos, 

 D. medinensis; 3 and 4, free embryo and embryos of D. medinensis in intermediate 

 host (Cyclops); 5, natural size of female" Filar'a bancrofti; 6, embryo of F. ban- 

 crofti in blood; 7, tail of male F. bancrofti; 8, male and female of F. loa (natural 

 size); 9, tuberculated integument and posterior end of male F. loa; 10, posterior 

 end of male F. perstans; n, male of F. bancrofti (natural size); 12, blunt tailed 

 embryo of F. perstans; 13, sharp tailed embryo of F. demarquayi. 



probably discharge through the oesophagus. The body when being 

 extracted is rather transparent. The tip of the tail is bent, form- 

 ing a sort of anchoring hook. Recently Leiper fed monkeys on 

 bananas containing infected Cyclops, and at the autopsy six months 

 later obtained both male and female forms. 



