DIBOTHRIOCEPHALUS LATUS 



313 



The " broad tapeworm " is a frequent parasite 

 of man in some districts, but it also occurs in the 

 domestic dog, and on rare occasions is found in 

 the domestic cat (together with Dibothriocephaliis 

 felis, Crepl.) and fox. French Switzerland and the 

 Baltic Provinces of Russia are the centres of distri- 

 bution ; from the former districts the distribution 

 radiates to France and Italy (Lombardy, Piedmont) ; 

 from the Baltic Provinces over Ingermanland 

 to Petrograd, over Finland to Sweden (on the 

 shore of the Gulf of Bothnia), in a southerly direc- 

 tion to Poland, and into the Russian Empire and 

 across it to Roumania, and towards the west along 

 the coast of the Baltic Sea to the North Sea, where, however, its 

 frequency considerably diminishes (Holland, Belgium, and the 

 North of France). 



In Turkestan and Japan the " broad tapeworm " is the most 

 frequent parasite of man ; it has been reported in Africa from the 

 vicinity of Lake N'gami as well as from Madagascar ; cases, in 



FIG. 208. Plero- 

 cercoid of Dibothrio- 

 cephalus latus. A., 

 with the head 

 evaginated ; B.> with 

 the head invaginated. 

 From the muscle of 

 the pike. 



FIG. 209. A piece of the body wall of the Burbot, Lota vulgaris. The 

 tangential section has exposed the muscles of the trunk, with a plerocercoid of 

 Dibothriocephalus latus. Natural size. 



part at least imported, have also come under observation in North 

 America. 



In Germany Dibothriocephaliis latus apart from the fact that 

 it is undoubtedly imported from Switzerland, Russia or Italy is 



