468 ARTICULATES: WORMS. 



Fig. 370. 



Earth- Worm, L. terrestris, Linn. 



Worm, or Angle- Worm, L. terrestris, Linn., which, when 

 fully grown, is six inches long, reddish, and is composed of 

 more than a hundred rings. It inhabits moist, rich soils. 



SUB-SECTION II. 



THE ORDER OF NEMATOIDS. 



THIS Order comprises worms known as Helminthes, 

 Entozoa, or Intestinal Worms. They live and multiply 

 in the interior of other animals. There is scarcely an 

 animal that is not inhabited by one or more species be- 

 longing either to this order or the next. 



GoRDiiDvE, OR GORDIUS FAMILY. This Family 

 contains worms which in their larva state inhabit other 

 animals, but not in the adult. They are long, thread-like 

 or hair-like in appearance, and live in fresh water and 

 mud. They are often called hair-worms, and persons 

 ignorant of their history suppose them- to be horse-hairs 

 transformed into worms ! 



SUB-SECTION III. 



THE ORDER OF TREMATODS. 



THIS Order comprises worms which are provided with 

 organs either at one or both extremities, by which they are 

 able to fix themselves firmly to the walls of internal cavi- 

 ties, to the flesh, or to the external surfaces of animals. 



HIRUDINID^E, OR LEECH FAMILY. This Family com- 

 prises worms which are oblong, and generally depressed. 

 The mouth is encircled with a lip, and the hind extremity 



