THE INVERTEB^TES 



141 



If a starfish, either fresh or preserved in alcohol, can be 

 had for examination, note that the body is covered by a 



-eye spot 



pyloric caecufk 

 'muscles of the pyloric caeca 



eye spot '- 



Fig. 58. Dissection of a starfish (Asterias sp.). 



skeleton composed of little plates, on which are short stout 

 spines arranged in irregular rows. At the tip of each arm 

 or ray there is a small red speck, the very simple eye of the 



