18 



hooks, and are stated to be capable of undulatory 

 movements (Gomes, Deslandes). 



Geography. This parasite is found more frequently 

 in France, Italy, Holland, Germany, Great Britain, 

 Egypt, and Abyssinia, than in other countries ; and, 

 although there seems no reason to suppose that the 

 conditions for their growth may not exist in other 

 places, the cause may probably be found in the differ- 

 ence of food. The Bothriocephalus latus (next to 

 be described), the embryo of which is supposed to live 

 in fishes, occurs in Russia, Sweden, Norway, Lapland, 

 Finland, Poland, and Switzerland, most of them coun- 

 tries bordering on the sea-coast, and using fish and 

 vegetables in larger quantities than those others 

 above mentioned. 



In former times it was supposed that these para- 

 sites existed singly in the intestine, hence the name. 

 This is a fallacy ; and it is now known that several 

 may reside together in the same intestine. 



