Concamerations, divided into compartments, as in the Nautili.
Concave, hollowed out like a bowl.
Concentric, running to a centre.
Conchæ, shells consisting of two or more pieces or valves, bivalves, or multivalves.
Cone, the form of a sugar-loaf.
Confluent, running together.
Conoid, a figure like a cone, sugar-loaf-shaped.
Contorted, twisted, or incumbent on each other, in an oblique direction.
Contracted, shortened, shrunk up.
Convoluted, rolled upon itself, twisted spirally, like a piece of paper rolled between the finger and thumb.