34 



HYDEOZOA, 



structure and yet so formidably armed, but more 

 especially because it is the type of a large class of 

 beautiful creatures, to which we must now beg the 

 attention of the young naturalist. 



The Hydr^e, as we have seen, are capable of loco- 

 motion, and w^ander about from place to place, but a 

 vast majority of the animals most nearly allied to it 

 in organization in their adult condition are fixed to 

 some foreign object upon which they grow. 



The Club Hydrse (Coryne)* for example (Fig. 19), are 

 always found growing upon the surface of some shell or 

 stone, to which they seem rooted by the extremity of a 



Fig. 19.— cobtke: a b, magnified; c, natural size. 



horny tube in whicli they live. In these creat'ires the 

 upper part of the body is dilated into a kind of club- 

 shaped head, armed with tentacula, which, instead of 

 being arranged in a single circle around the mouth, are 

 distributed irregularly over the exterior in such a manner 

 that, at first eight they seem as though they could be of 

 * KopvvT), liorune, a club. 



