152 ENTOZOA. 



consists of the parasitic worms, as the Tape-worm 

 (Ttenia), the Thread-worm and Kound-worm (As'- 

 cam), which live within the bodies of man and ani- 

 mals. It also inclndes the microscopic eel-like ani- 

 malcules (species of AnguiVlula) which are found in 

 sour paste (A. glutinis), in vinegar (A. aceti), and in 

 blighted wheat (A. trit'ici). Some of the species of 

 allied genera are met with in damp moss and in the 

 debris or fragments of vegetable substances decaying 

 in water. The general appearance of the microscopic 

 species is that of a minute colourless eel, writhing in 

 the water (PI. XI. fig. 1). Their internal organs are 

 difficult to distinguish. The alimentary canal is 

 usually evident, and dilated into a kind of stomach, 

 containing near its commencement some rod-like or 

 otherwise-formed teeth. In the species figured there 

 are two apparently tubular lancets, which are capable 

 of protrusion, and evidently serve to wound the prey. 



