TRANSMIGRATIONS AND METAMORPHOSES. 



219 



Fig. 63.— Taenia medio- 

 caneHata. 



worm, which has no crown of hooks m the middle of its 

 four suckers. 



This soHtary worm is introduced 

 by means of beef, and the cysticercus, 

 during its abode in the cow, mani- 

 fests ah'eady the peculiar character- 

 istics which enable us to recognize 

 the species, that is to say, no crown 

 of hooks, but four suckers, and in 

 the middle of them, some blotches 

 of pigment. Leuckart fed a calf with 

 eggs of this taenia, and at the end of 

 seventeen days, the animal died of 

 acute mihary tuberculosis, produced 

 by the great abundance of cysticerci. This second 

 species, which had been always confounded with the 

 preceding, and which is nevertheless the more common, 

 has therefore a different origin from the Tsenia solium. 

 Observations made quite recently in the north of Africa 

 demonstrate this. Great difficulty had sometimes been 

 felt in explaining the presence of the taenia in persons 

 who had not eaten pork. This embarrassment arose 

 from the confusion of the two species, and this con- 

 fusion is the more easy as the head of the colony must 

 necessarily be found in order to distinguish them. 



Scharlau, at Stettin, found taeniae in seven children 

 who had been fed, on account of anaemia, with raw meat. 

 The taeniae were those of this species. We have ourselves 

 found them in children to whom the use of raw meat 

 had been prescribed. 



We do not think it necessary to speak here of a 

 third species of taenia {T. nana), which also lives at our 



