THE CfELENTERATES 153 



are frequently brought in among the haul of the trawlers, attached 

 either to shells or stones ; and live specimens of these deep-sea 

 anemones may even be seen on the shells of whelks and bivalve 

 molluscs in the fishdealers' shops of London and other large towns. 

 One of the species in question the Parasitic Anemone (Sagartia 

 parasitica) is generally found on the shell of the whelk or some 

 other univalve ; and, if removed from its chosen spot, it will again 



FIG. 102. Sagartia parasitica 



transfer itself to a similar shell when an opportunity occurs. This 

 interesting anemone is usually seen among the dredgings of the 

 trawler, but may be occasionally met with on the rocky coasts 

 of the south-west, at extreme low-water mark. Though sometimes 

 seen attached to stones, shells may undoubtedly be regarded as 

 constituting the natural home of the species, and many regard the 

 former position as accidental or merely temporary, and denoting 



