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See: osmosis
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The new version of the gastraea theory, which proposes that the eumetazoan ancestor was a gastraea evolved from a "neotenic" larva of a homoscleromorph-like ancestor (Nielsen, 2008b), explains how a gastraea-like "homoscle-romorph" larva could have evolved into the eumetazoan ancestor with sealed epithelia and a gut with extracellular digestion.
A "gastrula" would be of no functional importance, because the sponges lack sealed epithelia and extracellular digestion in an "archenteron" would not be possible (Nielsen, 2008b).