Intestinal Parasites of the Dog. 299 



muscles, etc., of pike and turbot, tench, grayling, perch, etc. B. Cordatus : 

 2^ to 4 feet long, 400 to 600 segments, head flat, heart-shaped; lateral 

 bothridia, genital pore in centre of ventral surface ; in dogs and man in Green- 

 land. B. Fuscus : 3 to 27 inches long ; oviducts as dark blue spot in centre 

 of segment. B. Reticulatus ; B. Dubius: AUied forms in Iceland. Treat- 

 ment : Tseniacides. Prevention : Cook all fish fed ; exclude dogs receiving 

 raw fish. 



INFUSORIA. 



Lamblia Intestinales, (Blanch.), infests the dog in common 

 with the human being, sheep, rats and mice. It is pyriform 9 to 

 16 ju. long by 4 to 7 ;u, broad, and has four pairs of flagella attached 

 to the border of a large sucker. It is not especially injurious. 



Coccidium Perforans. This sporozoon is harbored in the 

 intestinal epithelium of man, dog, rabbit, cat and hen. It is 

 distinguished from the Coccidium Oviforme by its parasitism in 

 the bowels rather than the bile ducts, and by a shorter period of 

 evolution outside the animal body (Leuckart). The parasite will 

 be more fully considered under coccidiosis of the rabbit. 



They cause swelling and clotidiug of the epithelium, with aggre- 

 gation tending to form white points, and finally desquamation, 

 lyocal inflammation with anorexia, indigestion, colic, diarrhoea, 

 with nervous (rabiform) symptoms and emaciation. 



Coccidium Bigeminum. Styles gives this name to a coc- 

 cidium which occurs in pairs in the villi of the small intestine of 

 the dog. They vary in diameter from 7 /u. to 16 /«., and each con- 

 tains four fusiform spores. No distinct pathogenesis has been 

 traced to them. 



CKSTODES. TAPEWORMS. 



Like all carnivora, the dog is very subject to tapeworms, and' 

 especially harbors them in the mature (taenia) form in the in- 

 testines. The cystoido-tsenia which live in another host in their 

 cystic or bladderworm stage, are derived usually from the 

 herbivorous animals on which the dog preys. 



The taenia of the dog may be tabulated and in the main differ- 

 entiated by the following table : 



