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Having unequal valves, as the shell of an oyster.

Having no essence or being. H. Brooke. The womb of inessential Naught. Shelley.

rth (Geol.), a deposit of fine, usually white, siliceous material, composed mainly of the shells of the microscopic plants called diatoms. It is used in polishing powder, and in the manufacture of dynamite.

An extinct genus of large, fossil, bivalve shells,allied to the mussels. The genus is characteristic of the Cretaceous period.

Having no operculum; -- said of certain gastropod shells.

Having the pallial line entire, or without a sinus, as certain bivalve shells.

as a bed or stratum, between the layers of a regular series of rocks. Beds of fresh-water shells . . . are intercalated and interstratified with the shale. Mantell.

The open space between the inner and outer shells of a dome or cupola of masonry.

o penetrate between or within; to penetrate mutually. It interpenetrates my granite mass. Shelley.

tween the transparent, or septal, zones in striated muscle; the interseptal chambers of a shell, or of a seed vessel.

Transpicuous within or between. [R.] Shelley.

To cause to become or to resemble an island; to make an island or islands of; to isle. Shelley.

s Corosso nuts. -- Ivory palm (Bot.), the palm tree which produces ivory nuts. -- Ivory shell (Zoöl.), any species of Eburna, a genus of marine gastropod shells, having a smooth surface, usually white with red or brown spots. -- Vegetable ivory, the meat of the ivory nut. See Ivory nut (above).

gged or sharp protuberance; a denticulation. Arethuss arose . . . From rock and from jag. Shelley. Garments thus beset with long jags. Holland.

has little merit; hence, the verse itself." The least jingle of verse." Guardian. Jingle shell. See Gold shell (b), under Gold.

part of a seed; all that is within the seed walls; the edible substance contained in the shell of a nut; hence, anything included in a shell, husk, or integument; as, the kernel of a nut. See Illust. of Endocarp. ' A were as good crack a fusty nut with no kernel Shak.

Relics of neolithic man found on the coast of Denmark, consisting of shell mounds, some of which are ten feet high, one thousand feet long, and two hundred feet wide. The name is applied also to similar mounds found on the American coast from Canada to Florida, made by the North American Indians.

Inner margin of the aperture of a shell.

A piece of wood, shell, stone, or other substance, worn in a perforation of the lip or cheek by many savages.

The external margin of the aperture of a shell. See Univalve.