302 



General Biology 



Fig. 188. 



Oxyuris Vermicularis 



The male is on the left, the 



female on the right. 



(After Claus.) 



Fig. 189. Eggs of the More Important Worms Which Are 

 Parasitic to Man. 



As all are of the same magnification, a comparison of the rela- 

 tive sizes is possible. 



1, Fasciolopsis buskii; 2, Schistosoma mansoni; 3, Schistosoma 

 haematobium; 4, Schistosoma japonicum; 5, Paragonimus wester- 

 manii; 6, Clonorchis sinensis; 7, Metagonimus yokogawai; 8, Taenia 

 saginata; 9, Taenia solium; 10, Hymenolepsis nana; 11, Hymeno- 

 lepsis diminuta; 12, Diphylloboth'rium latum (Dibothriocephalus 

 latus) ; 13, Ascaris lumbricoides (egg without outer coating); 14, 

 Ascaris lumbricoides (abnormal egg); 15, Ascaris lumbricoides; 16, 

 Trichuris trichiura, 17 and 18, Hookworm eggs; 19, Enterobius 

 vermicularis oxyuris vermicularis ; 20, Oxyuris incognita; 21, Tricho- 

 strongylus orientalis. (After Hegner and Cort's "Diagnosis of Pro- 

 tozoa and Worms Parasitic to Man." Bull. Johns Hopkins Uni- 

 versity School of Hygiene and Public Health.) 



slightly reddish color. There is no intermediate host. The animal 

 occupies the upper portion of the small intestine. Usually one or two 

 are found in a single location, although sometimes vast numbers of 

 them may be found. The worm may pass to the stomach and be 



