200 THE AQUARIAN NATURALIST. 



much more active animals than the Ophiuri, which 

 in many respects they closely resemble. They seldom 

 remain quiet for a moment, but are continually 

 twisting about their arms ; and, if laid hold of, they 

 break into little pieces with wonderful facility, each 

 fragment of an arm also breaking itself up into smaller 

 pieces; indeed, frequently, when we seize one of 

 these creatures, we find nothing but the disc re- 

 maining. 



