184 MICROSCOPY FOR BEGINNERS. 



low power appears as if truncated. The round mouth 

 is at the centre of this end, and leads into an oblong 

 pharynx or throat. The tail is usually long and sharply 

 pointed. The worm's movements are 

 generally slow and deliberate, but oc- 



are reproduced by eggs, one or more often being visible 

 within the transparent body. Anguillulse are common 

 in wet moss, among the leaflets of aquatic plants, and 

 in the ooze of the ponds. 



The well-known " vinegar-eel " is an Angnillula (An- 

 guUlula aceti); and the paste- worm (A. glutinis) be- 

 longs to the same genus. Some naturalists regard these 

 as the same species. 



V. OLIGOCHJETA. 



The fresh-water bristle-bearing worms whose bodies 

 are never ciliated, show more or less distinctly that they 

 are formed of segments or rings. Each segment often 

 has on both sides near the back one or more long, fine, 

 hair-like bristles extending into the water, and together 

 forming a row along each side of the worm. On the 

 lower surface there are two or more rows of thicker, 

 inflexible, and gracefully curved spines, the rows being 

 formed of clusters which have two or more spines in 

 each, the free end of every one being usually divided 

 by a deep notch, so that it appears like a double hook, 

 the parts being unequal in size and degree of curvature. 

 They are used to assist the worm to crawl, and are 



