C(ELENTERATA 



213 



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

 well fed, they usually show female characters. 



sf 



.- 



..* 



.***** 







"x; 



/ 



\ # f 



*a ; ^- 



r :'.'* ., : ., r 



4f \ \ / I 



JT U / / 



^. >-: ^i;---.v- ' y **i 



^-^"r-.fc^^^^r 1 



'"... .< 





y 



Drawing by W. P. Bay 



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

 with batteries of nematocysts ; enlarged about 5 diameters. 



5. The ccelenterates are divided into three great Divisions of 

 groups, the Hydrozoa or Hydromedusse, the Scyphozoa Ccelenterata 

 or Scyphomedusse, and the Anthozoa. The first con- 

 tains the hydroid zoophytes, hydra and other less-known 

 animals ; the second the true medusae or jellyfishes ; the 

 third the sea anemones and their relatives. Nearly all 

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



