拳卷的，旋卷的卷成线圈样式，其尖端在中间的，如未展开的蕨叶的。

Rolled up in the form of a coil with the tip in the center as an unexpanded fern frond .

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拳卷的，旋卷的卷成线圈样式，其尖端在中间的，如未展开的蕨叶的。

Rolled up in the form of a coil with the tip in the center, as an unexpanded fern frond.

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某些绝种的头足类动物具有特殊的旋卷形态。

Certain extinct cephalopods have an unusual coiling shape.

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