AKTICULATA. 227 



move from place to place; the mouth is in the centre. They 

 live upon small marine animals, and have the power of 

 reproducing any of the rays which happen to be broken off ; 

 and if cut into two or more pieces, each will produce a fresh 

 animal. There is a species of Star-fish, so brittle, that it ia 

 quite impossible to touch it without breaking it, or rather it 

 breaks itself, for it seems to have the power of casting off ita 

 arms at pleasure. These forms complete the Radiate series 

 of animals, they have nearly all a somewhat regular radiated 

 form, and some of them are very beautiful, such as Sertularia, 

 which grow in communities and form many beautiful 

 branched objects, much resembling sea-weeds and flowers, 

 hence the name Zoophyte, which means animal flowers. 



FIG. 13. EARTH WORM (Lumbricus terrestris), LEECH (Hirudo medicinale). 



The Articulata form the second division of the Inverte- 

 brata. It has five classes, the first of which is the Annellata ; 

 in this order are included the Worms and Leeches (fig. 13), 

 these have no hard covering but are soft throughout, they 

 are made up of a number of soft rings which encircle their 

 bodies from one end to the other, and are capable of being 



Q2 



