Shell

The hard outer covering of invertebrate creatures, composed of calcareous or chitinous material.

Works of Art

The hard outer covering of invertebrate creatures, composed of calcareous or chitinous material.

Works of Art

2020

c. 1250–1350

c. 2600–2400 B.C.E.

c. 2900–2600 B.C.E.

300–600 C.E.

2017

begun c. 526–527

begun c. 526–27, consecrated 547, with later restorations

540s

19th century

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