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Pennaria tiarella McCr. A.Medusa from which the ova has been expelled. B.Medusa expelling an ovum.
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Pennaria tiarella. 1-Male, 2-Female, 3-Hydroid; 4-Portion of colony; 5-Single hydranth with medusoid.
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Pennaria tiarella, a branch....
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Pennaria tiarella McCr. A.Branch of Colony. B.Hydranth with medusae (enlarged). C.Single sessile medusa (enlarged).