THE INVERTEBRATES 



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 



muscles of the pylonc caeca 



reproductive glands 



"'< urdiac steia< It 

 * " -intestinal caecum 



' 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 j-ows. At the tip of each arm 

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



