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"When the carpels consist of several whorls on the same plane, the individuals of contiguous whorls follow the same law of alternation, as is exhibited in Fig. 133, in which a represents the axis, b b the whorl contiguous to it, and c c the exterior whorl."—Darby, 1855

Two Whorls of Carpels

"When the carpels consist of several whorls on the same plane, the individuals of contiguous whorls…

"Gyroceras goldfussi. GYROCERATIDAE. A family of nautiliform shells of a discoidal shape, in which the last whorl is parallel with the others, all being connected." -Whitney, 1911

Nautiloid

"Gyroceras goldfussi. GYROCERATIDAE. A family of nautiliform shells of a discoidal shape, in which the…