jpdb beta

carapace; shell; crust

shell; crust

(Earth's) crust

eggshell

shell structure

sea shell

cupule; acorn cup

continental crust

coconut shell

putamen (part of brain); frustule; silicified cell wall of a diatom

coconut shell

electron shell

hard-shelled nut (e.g. walnut, pecan, almond)

bivalves

cochlea

Rostroconchia (class of extinct molluscs)