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MANUAL OF ZOOLOGY 



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Fig. 48 — Physalia. The living animal 

 floating on the surface of the sea. cr, 

 crest ; p, polype ;^«,pneumatophore, 

 float, or air-sac. (After Huxley.) 



Fig. 49. — Physalia arethusa, natural 

 size. (After Agassiz.) 



