HYDATIDS OR TAPE-WORMS. 



225 



Fig. 83. 



One of these occupies the abdominal cavity of the sheep, and is 

 called the 



Diving Bladder-worm, Cysticercus t^nuicollis or C. tania margina- 

 ta. These bladders are often free in the 

 abdomen, are sometimes enclosed in the 

 fat, and sometimes are attached to the 

 liver and intestines. They are pear- 

 shaped, and in size from that of a walnut 

 to that of a hen's or even a goose's egg. 

 These bladders or cysts, when fed to a 

 dog, have produced the mature tcenia 

 marginata upwards of three feet in length 

 in the course of three months. The eggs 

 of this tape-worm have been fed to lambs, and have produced the 

 hydatid, or bladder-worm, of which hundreds were found in the 

 abdomen of some of the lambs, which died soon after receiving 

 the eggs. 



Figure 83 is a representation of the Cysticercus tenuicottis, with 

 the head turned out- 

 wards, and with the 

 head contained within 

 the neck of the blad- 

 der. Another of these 

 hydatids is the 



Many-headed Blad- 

 der-worm, or Cysticer- 

 cus tania echinococcus. 

 This finds a home 

 in the lungs and liver 

 of the sheep and other 

 ruminants, and also 

 infests mankind. Fig- 

 ure 84 is an illustra- 

 tion of the liver and 

 lungs of an infected 

 sheep. As many as 

 several hundred cysts 

 have been taken from 

 one sheep. This is a 

 most dangerous para- Fi &- ** LUNGS INFECTED WITH HTDATIDS. 

 site, for if taken into the human stomach, it may produce " bladders" 

 in the brain, as it actually nas done in well authenticated cases, 

 which are certainly fatal. The cysts reproduce themselves by a 



