The Polyzoa are colonial animals, the colony (zoarium) originating in most cases from a free-swimming larva, which attaches itself to some solid object and becomes metamorphosed into the primary individual, or "ancestrula." [Please select]
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A zoarium with its included polypides is finally produced from the young polypide by the rapid development of buds. [Please select]
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In a few freshwater species belonging to the genera _Cristatella_, _Lophopus_, _Lophopodella_ and _Pectinatella_, the whole zoarium has the power of progression. [Please select]
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--Part of the zoarium of _Victorella bengalensis_ entirely transformed into resting buds, × 25. [Please select]
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--Zoarium of _Lophopodella carteri_ moving along the stem of a water plant, × 4. [Please select]
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It possesses a creeping "sole" or organ of progression at the base of the zoarium. [Please select]
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The zoarium as a whole is either recumbent and adherent or at least partly vertical. [Please select]
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The growth of the zoarium is much more luxuriant, and the form of the resting buds is different. [Please select]
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Most, if not all species are hermaphrodite, eggs and spermatozoa being produced either simultaneously or in succession by each individual, or by certain individuals in each zoarium. [Please select]
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The two valves of the statoblast often remain attached to the zoarium that has emerged from between them until it attains considerable dimensions (see Plate IV, fig.) [Please select]
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