Rotalia

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One group will take the spherical form and produce a shell in the shape of the nautilus. Some are more or less oblong, each new segment being nearly equal to the entire length of the shell.

Source

Hazlitt Alva Cuppy PH.D., Editor Beauties and Wonders of Land and Sea (Springfield, OH: Mast, Crowell & Kirkpatrick, 1895)

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