THE BLADDER-BEARER. 



The Bladder-bearer, in common with its kin. is lilerally a host in itself. It is a host o( polyps or swimminB-bells united to a 

 common system of swimming-bladders. Different functions are assigned to different sets of polyps; some steer the whole craft. 

 others look after food supplies, while others again produce eggs or control the stinging tentacles. 



