WATSON IUS WATSON I 



235 



Female Organs. Ovary dorso-posterior of posterior testis. Shell 

 gland dorsal to ovary. Vitellaria ventral and lateral to gut caeca 

 extending from gut fork to equator of acetabulum. Uterus dorsal 

 to testes, ductus hermaphroditicus absent. Laurer's canal opens in 

 dorso-median line slightly behind anterior border of sucker. 



FIG. \Tfl.-Watsoniiis watsoni : ventral projection composed 

 from a series of transverse sections, o.s. , oral sucker ; s.p., suc- 

 torial pouch; ga., genital atrium; d.e., ejaculatory duct; 

 es., oesophagus ; e.g., oasophageal ganglion ; p.p., pars prostatica ; 

 p.m., pars musculosa ; z'., gut; uf., uterus; v.e,, vas efferens; 

 v.e.s., left vas efferens ; v.e.d., right vas efferens ; v.g., vitellarium ; 

 /., testes ; ov ., ovary ; s.g., shell gland ; t.vd., transverse vitelline 

 duct. (After Stiles and Goldberger.) 



Eggs. 123 fji to 133 fju long by 75 //, to 80 //, broad. 



Habitat. Jejunum and duodenum of man, German West Africa. 

 The parasite has only been found once in man. The patient, a negro 

 from German West Africa, died at Zola, Northern Nigeria. The 

 symptoms were persistent watery diarrhoea without blood or mucus. 

 The parasites were also passed in the stools. It occurs also in 

 monkeys. 



