254 



ZOOLOGY. 



Almost all zoophytes live in the sea, but some few 

 in fresh water; none are important agriculturally. 

 The following belong to this sub-kingdom: 1. The 

 Hydroid Zoophytes (Hydrozoa), including the medusas 



Fig. 14Y. — A Phosphorescent Jelly-fish {Pdagia 

 noctiluca'), i the natural size. 



Fig. 146.— Fresh-water Polype 

 {Sydra)i bearing two buds of 

 different ages. Highly magni- 

 fied. 



Fig. 148.— a Sea Anemone (^Sagartia nivea). 



of the North Sea, many o£ which are the sexual stage 

 in the life history of fixed asexual polypes. The 

 common Freshwater Polypes (Hydra viridis, fusca, 

 etc.). 2. The Flower Polypes (Anthozoa), to which 



