250 



FLAT WORMS 



Fascioletta ilocana. This is a small fluke, about 1/4 inch (6 mm.) long. There 

 are two massive testicles in the posterior part of body. The acetabulum is promi. 

 nent. The egg of this small fluke is quite large (ioc/0 and has an operculum. 

 These trematodes were found by Garrison in five natives of Luzon, P. I., after treat- 

 ment with male fern. 



FIG. 65. Anatomy of a tape-worm, Tasnia solium (A., longitudinal, B., cross 

 section); a fluke, Paragonimus westermanii (C)., male and female nematode, Oxyuris 

 vermicularis (D.). A. i, Testes; 2, yolk glands; 3, shell glands; 4, ovary; 5, vagina; 



6, vas deferens; 7, uterus before branching; 8, water-vascular system. B. i, Cuticle; 

 2, circular muscle; 3, ovary; 4, testes; 5, uterus; 6, excretory canal; 7, nerve cord. 

 C. i, Oral sucker; 2, acetabulum; 3, uterus; 4, testes; 5, excretory canal; 6, ovary; 



7, yolk glands. I), (a) Female, i, Vulva; 2, uterus; 3, bulb of oesophagus; 4, anus; 

 (b) Male, i, Bulbous mouth end; 2, testes; 3, spicule; 4, alimentary canal. E. 

 Egg of P. westermanii. 



LUNG FLUKES. 



Paragonimus westermanii (Distoma ringeri). In certain parts of 

 Japan and Formosa it is estimated that as many as 10% of the inhab- 

 itants may harbor this parasite. 



It is also common in China, and recently many cases have been reported in the 

 Philippines. Dr. Stiles states that around Cincinnati, Ohio, there was at one time 

 quite a heavy infection among the hogs, so that it may be that certain cases diagnosed 

 in man as pulmonary tuberculosis are paragonimiasis. 



