140 



PRACTICAL PARASITOLOGY 



end, close to the middle line, show the relationship of the different parts 

 of the sucking apparatus (mouth, pharynx and ventral sucker) to one 

 another ; they will also include the cirrhus pouch and, frequently, 

 cirrhus (fig. 62). 



Two species of Paramphistomide (Gastrodiscus hominis and Clc 

 chis watsoni] occur in man, and it is expedient for this reason that" 

 the student should make himself acquainted with the structural 

 peculiarities of the Paramphistomatidse of mammals. The best subject . 

 is Paramphistomum cervi, frequently found in the paunch of oxen. 



FIG. 62,Fasciola hepatica, L. 

 Longitudinal section in the median 

 line through the anterior portion of 

 the head process, showing mouth, 

 pharyngeal sacs, pharynx and oeso- 

 phagus. Magnified. (After Leuckart.) 



D. 



If. 



FIG. 63. Metorchis truncatus (Rud.)., 

 25 : 1. Bs., Ventral sucker. D., Stomach- 

 tubes. Dst., Yolk-glands. JET., Testes. 

 K. , Ovary. Us., Receptaculum seminis. 

 Ut. t Uterus. 



Specimens should be killed in Miiller's mixture, alcohol, or sublimate, 

 and cleared in creosote. A representative of the Schistomatidae will 

 not be found in these latitudes, although Schistosomum hcematobium 

 occurs in man with some frequency in Egypt, and another species 

 of the same family is found in cattle in Southern Europe. 



The varieties of Trematode parasitic to indigenous domestic 

 mammals are not very numerous. The liver-fluke is found in the 

 gall-ducts of sheep and, less frequently, in cattle, goats, horses, asses, 

 and rabbits. The lancet-fluke, though rarer, may occur alone or in 

 company with the liver-fluke, and occasionally "wanders" to the 



