86 



BOARD OP AGRICULTURE. 



cases, incurable, and such diseased slieep are too often sent 

 to the market. Fortunately, man cannot be infected with 

 this parasite. 



When one of these tumors is removed with care, it will be 

 found to consist of a thin, white, translucent cyst or sac, 



roundish, oval, 



Figure 63. 



or irregular in shape. On one side may be 



Figure 64. 



seen clusters of little white spots (Figure 62) . K the spots 

 be examined with a lens, each one will be found to consist of 

 the minute head and neck of a young tape-worm, projecting 

 from the surface, and provided with four suckers and a circle of 



Figure 65. 



hooks, as usual in young tape-worms in this stage of their 

 growth (Figure 63). Or else the heads will be found to be 

 withdrawn into the sac, each in its own capsule, and then 

 the spots are made by small depressions or pits, with a slit- 

 like opening at the bottom. If the interior of the sac-mem- 

 brane be examined with a microscope, each pit will be found 



Figure 63. — Portion of tlie outer membrane, with the heads of Coenurus. En- 

 larged four diameters. From Davaine. 



Figure 64. — Inner surface of the membrane of the cyst, with inverted heads, 

 magnified. Heartli and Home, after Thudiclium. 



Figure 65. — Brain of shesp in which the young embryos of Cienurus have ex- 

 cavated galleries. Davaine, after Van Henedeu. 



