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- 
AY: 
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oy (C 
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es 
gS 
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=SZN 
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Fite ee 
vio aWily, 
RRA int AaAnn 
Sakata VAS ae 
Physalia, or Portuguese Man-of-War. 
dractinia. As in the latter, some of the indi- 
viduals are Meduse-bearing, and others simple 
