CCELENTERATA 



213 



it is said to be a hermaphrodite. When the animals are 

 well fed, they usually show female characters. 



""'*"%, 



Drawing by W. P. Hay 



FIG. 48. A hydra (Hydra oligactis), with two buds, a and b ; m, mouth ; /, tentacles 

 with batteries of nematocysts ; enlarged about 5 diameters. 



5. The ccelenterates are divided into three great Divisions of 

 groups, the Hydrozoa or Hydromedusae, the Scyphozoa Ccel 

 or Scyphomedusae, and the Anthozoa. The first con- 

 tains the hydroid zoophytes, hydra and other less-known 

 animals ; the second the true medusae 1 or jellyfishes ; the 

 third the sea anemones and their relatives. Nearly all 

 these animals are marine, but Hydra is a common fresh- 



