48 HYDROIDS AND JELLY-FISHES. 



shine ; and sometimes, if you have one of the largei 

 ones, you may see the light run along the more highly 

 organized parts of the whole body. He seems to 

 tell you thus, in fiery characters, the story of his own 

 structure. 



I have told you that all animals like the Sea-Anem- 

 one, that is, with the stomach hanging in the cen- 

 tre, and the rest of the body divided by partitions, 

 are called Polyps. As we have come to the end 

 of our talk about Jelly- Fishes, I will give you their sci- 

 entific name also. All animals constructed like Jelly- 

 Fishes, that is, with a transparent, jelly-like body, 

 traversed by tubes like little channels running through 

 it, and with the stomach hollowed out of the substance 

 of the body, are called Medusa or Aealephs. Now 

 I will tell you something about Star- Fishes and Sea- 

 Urchins, or, as I think you have heard them called, 

 Sea-Eggs. 



