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A fossil shell, curved like a ram's horn; an obsolete name for an ammonite.

The shelly skeleton of a sea urchin.

Of or pertaining to the shell of a sea urchin. Coronal suture (Anat.), a suture extending across the skull between the parietal and frontal bones; the frontoparietal suture.

Girt about the spire with a row of tubercles or spines; -- said of spiral shells.

A marine shell of the genus Cypræa.

acea. They are mostly marine, and usually have a broad, short body, covered with a strong shell or carapace. The abdomen is small and curled up beneath the body.

A partially compacted bed of gravel mixed with shells, of the Tertiary age.

h forms the top of the furnace or fire box of an internally fired steam boiler. -- Crown shell. (Zoöl.) See Acorn-shell. -- Crown side. See Crown office. -- Crown tax (Eccl. Hist.), a golden crown, or its value, which was required annually from the Jews by the king of Syria, in the time of the Maccabees. 1 Macc. x.…

ken down or in, or pressed into a smaller compass, by external weight or force; as, an eggshell crushes easily.

The hard external coat or covering of anything; the hard exterior surface or outer shell; an incrustation; as, a crust of snow. I have known the statute of an emperor quite hid under a crust of dross. Addison. Below this icy crust of conformity, the waters of infidelity lay dark and deep as ever. Prescott.…

A crust or shell.

classes of the arthropods, including lobsters and crabs; -- so called from the crustlike shell with which they are covered.

Pertaining to, or of the nature of, crust or shell; having a crustlike shell.

The state or quality of being crustaceous or having a crustlike shell.

Empty oyster shells and other substances laid down on oyster grounds to furnish points for the attachment of the spawn of the oyster. [Also written cutch.]

To gather or throw into a heap; to heap together; to accumulate. Shoals of shells, bedded and cumulated heap upon heap. Woodward.

A small shellfish; the limpet or patella.

The shell or bone of cuttlefishes, used for various purposes, as for making polishing powder, etc.

A cephalopod of the genus Sepia, having an internal shell, large eyes, and ten arms furnished with denticulated suckers, by means of which it secures its prey. The name is sometimes applied to dibranchiate cephalopods generally.

A genus of marine univalve shells; the gondola.