Nummulina Perforta

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One group will take the spherical form and produce a shell in the shape of the nautilus. In this case, the external convolutions conceal those previously formed.

Source

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

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