280 



OTHER INTESTINAL ROUNDWORMS 



FIG. 113. Life history of Strongyloides stcrcoralis. A, adult female in intestine 

 (note long pharynx, egg-containing uterus and vaginal opening on posterior third 

 of body; B, newly born embryo as passed with faeces; C and D, adult female and 

 male, respectively, of free-living generation; E, " rhabditif orm " larva, from female 

 of free-living generation; F, filariform larva, resembling grandparent, and formed 

 by metamorphosis of E, ready to infect by boring through skin. X 75. (Partly 

 after Looss.) 



