THE ROUND WORMS 



ryos 



anterior end of the worm projects to pour forth its striated embry 

 upon contact with water. 



The mouth is terminal and the body uniformly cylindrical. The uterus is a con- 

 tinuous tube filled with sharp-tailed, transversely striated embryos, 650 X i7/i, and 



Fig. 73. (la) Adult female Guinea worm (Dracuncidus medinensis} showing 

 anchoring hook at posterior extremity, (ib) Cross section of female Dracunculus 

 showing uterus filled with embryos, (ic) Striated embryos of the Guinea worm, 

 (id) Cyclops coronatus, the minute crustacean which serves as the intermediate host 

 of D. medinensis. (2a-2d) Anterior and posterior extremities of F. loa. (zc) Sec- 

 tion showing tuberculated cuticle. (2b), Male and female F. loa, natural size. (3a) 

 Bulbous anterior extremity, Filaria bancroft. (36) Tail of male. (3c) Tail of female. 

 (3d). Male and female, natural size of F. bancrofti. (4a) Tumor mass of F. volvulus 

 laid open. 5, Mosquito showing filarial embryos in thoracic muscles (a) and in 

 labium (b). The labella which are separated from the labium by Button's mem- 

 brane are seen at (c). 6. (a) Embryo of F. bancrofti (b) embryo of F. loa showing 

 filling of tail end with cells. 7, Micrafilaria of F. bancrofti in blood. Dotted lines 

 show location in break in cells column and V spot. 



constitutes the greater part of the body, the alimentary canal being pressed to one 

 side. The genital organs probably discharge through the oesophagus. The body 

 when being extracted is rather transparent. The tip of the tail is bent, forming a 

 sort of anchoring hook. Recently Leiper fed monkeys on bananas containing in- 

 fected Cyclops, and at the autopsy six months later obtained both male and fe- 

 male forms. 



