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A See also: Orbigny, a genus of Perforate See also: Foraminifera (q.v.) of pelagic habit, and formed of a conical See also: spiral aggregate of spheroidal See also: chambers with a crescentic mouth
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The shells accumulate at the bottom of moderately deep seas to See also: form " See also: Globigerina ooze " and are preserved thus in the See also: chalk
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Hastigerina only differs in the " flat " or nautiloid spiral
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