ALTERNATE GENERATIONS. 259 
brilliant. crested float. In this curious Acale- 
phian Hydroid, or Physalia, the individuality of 
function is even more marked than in the Hy: 
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Paysalia, or Portuguese Man-of-War. 
dracfinia. As in the latter, some of the indi- 
viduals are Meduse-bearing, and others simple 
