ENTOZOA. 



173 



itself may be consumed by man in his food and water, and carried within 

 his tissues, very commonly to be permanently lodged within the abdom- 

 inal cavity and brain. The mature form, in this instance, is of course 

 never attained, unless through some rare mischance the man be devoured 

 by the dog or wolf. 



As may be inferred from the above statements, the T. solium is more com- 

 mon with pork-eaters, as the T. mediocanellata is with consumers of beef. 

 Underdone meats, or raw sausages, partially smoked beef and hams are pro- 

 lific sources of disease. In the case of T. echinococcus, filthy association 

 with dogs favors the development of hydatids. In Iceland, where, in addi- 

 tion to such surroundings being very constantly present, the conditions are 

 exceedingly favorable to increase of entozooic life, the ratio of occurrence 

 of hydatids in the human subject is perhaps greater than in any other part 

 of the world. It is calculated by Krabbe that one out of every forty, and 

 by Schleisner one out of every seven inhabitants harbor hydatids. 



In Bothriocephalus the scolex is formed as in Tcenia, and lives in the in- 

 testinal canal of smaller aquatic animals, in the immature state. The strobile 

 is found within rapacious aquatic animals, piscivorous birds and mammals. 

 Proglottides very frequently separate in long conjoined series of segments. 

 Embryos with six hooks. Coverings to ovules frequently colored. (Klichen- 

 meister.) 



The following table is designed to show the localities of the larval and 

 mature stages, as far as known, of the species of Taenia infesting the human 

 subject. 



T. solium. 



Strobile and ) 



Man. 



Proglottis. J 

 Embryo. Earth. 

 Cysticercus { Hog (rarely man). 



(hydatid). J (G. cellulose). 



T. mediocanellata. 

 Man. 

 Earth. 

 Cow or sheep. 



Strobile and ) 

 Proglottis. J 



Strobile and) 



Man. 



Man. 



T. echinococcus. 

 Dog. 



Earth. 



Cow or sheep (comp. 



rarely man). 

 (hydatid). 



Dog. 



T. acanthotrias. 



TTnknown * 



T. flavopuncta. 



T. nana. 



Proglottis. | 

 Embryo. Unknown. 

 Cysticercus. Man. 

 Strobile and ) TT , 



Proglottis. j Unknown. 



T. elliptica. 



Embryo. Unknown. 

 Cysticercus. Unknown. 

 Strobile and ) -M 

 Proglottis. | Man ' 



Man. 



Unknown. 

 Unknown. 



Man. 



T. marginata. 



Dog and wolf. 



Unknown. 



Man (C.temiicollis). 



Dog and wolf. 



Man. 



Unknown. 

 Unknown. 



Man. 



T. lopkosoma. 



Man. 



Unknown. 

 Unknown. 



Man. 



