FLUKE-WORM. 299 



CLASS VI. WORMS. 



ORDER I. INTESTINAL WORMS. 



The animals which are arranged under this order have 

 had their names from their simple form, and the circum- 

 stance of the greater part of them being found in the 

 intestines, or viscera, of other animals, where they live 

 and feed. Some, however, as the wire-worms, earth- 

 worms, and leeches, reside in water, or in the ground. 

 Their bodies are simple, naked, and destitute of limbs or 

 members. There are several distinct tribes, of which 

 the following are the principal. 



ASCARIDES. These are long, round,and slender worms, 

 somewhat pointed at each end. They are found in the 

 intestines of men and animals. The kind called Vermicu- 

 lar Ascarides, which are so teasing in the bowels of 

 children, are, perhaps, more generally known than any 

 of the others. In length they seldom measure much more 

 than an inch, and are thin, white, and smooth. They fix 

 themselves by three points at their head, and suck the 

 nutritive juices through an opening which is in the cen- 

 tre betwixt them. 



FLUKE-WORMS are of an oblong and flat shape, and 

 found in the livers and other internal parts of different 

 animals. Fluke-worms are oftentimes found, in great 

 abundance, in the livers of sheep, particularly in those 



