288 CRUSTACEA, ECHINODERMS, ETC. 



and healthy in an aquarium. There can be no 

 wonder, therefore, that it is sought after, and con- 

 sequently exhibited in our public aquaria. Others 

 of the non-tubed worms, the Nereis, for example, 

 although not so brilliantly coloured, are very graceful 

 and pretty marine creatures. The habits of some of 

 the prettiest, however, belie their lovely appearance ; 

 for they are not unfrequently those of the well-clad 

 stage ruffian who struts about in garments which 

 have been obtained by means of murder and robbery. 

 Not a few of the " errant," or wandering worms, live 

 by stealthily preying upon objects actually more 

 highly organised than themselves. 



