316 



ENTOZOA ; CffiLELMINTHA. 



Solium, or Tape-worm. The body of this animal is distinctly 

 divided into joints or segments; which sometimes amount to 

 several hundred ; the whole animal occasionally attaining the 



FIG. 535. TiENiA SOLIUM. 



length of ten feet. These segments are all connected by the 

 nutritive canal, which runs from one end to the other ; but 

 the reproductive apparatus is repeated in each division. The 

 head is small, and possesses a double circle of small hooks. Its 

 existence is essential to the life of the body, which dies if the 

 head be broken off; but if some of the joints remain attached to 

 the head, it continues to grow and form new ones. The so-called 

 Eels of vinegar and sour paste are referrible to this group, in 

 regard to the simplicity of their structure and their worm-like 

 form ; although their habitation is so different. There is also 

 a little worm-like animal closely allied to these, which is found 

 in diseased ears of wheat, and which possesses remarkable 

 tenacity of life, being revived by moisture after having been 



dried for almost any length of 

 time. The accompanying figure 

 represents one of the Entozoa, in 

 which the Vermiform aspect is 

 almost completely wanting. This 

 animal possesses a head much re- 

 sembling that of the Tape-Worm; 

 but instead of having a long jointed 

 body, it dilates behind into a large 

 bag, which contains only fluid. It 

 does not frequent the cavities of the body, like the Intestinal 



FIG. 536. CYSTICERCUS CBLLTILOS^: ; 

 a, head enlarged. 



