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1.             Animal a solitary or colonial polyp. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

                Animal a medusa (jellyfish). . . . . . . . . . Petasidae, Craspedacusta sowerbyi      

2.             Animal a solitary polyp. . . . . . . . . . . . . . . . . . . . . . . . . Hydridae, Hydra sp.

                Animal joinded with others to form a cluslter or colony; either by means of a                 direct connection or through a common structure. . . . . . . . . . . . . . . . . . . . . .                 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Clavidae, Cordylophora caspia

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Key to Genus & Species