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The cavity or socket of the skull in which the eye and its appendages are situated.

A hard substance, somewhat like bone, which is sometimes deposited within the pulp cavity of teeth.

The cavity in the skull in which the parts of the internal ear are lodged.

A name popularly given to the delicate morsel contained in a small cavity of the bone on each side of the lower part of the back of a fowl. Fresh-water oyster (Zoöl.), any species of the genus Etheria, and allied genera, found in rivers of Africa and South America. They are irregular in form, and attach themselves to r…

he inner surface of a bivalve shell. See Illust. of Bivalve. Pallial chamber (Zoöl.), the cavity inclosed by the mantle. -- Pallial sinus (Zoöl.), an inward bending of the pallial line, near the posterior end of certain bivalve shells, to receive the siphon. See Illust. of Bivalve.

Obovate, with a concavity in each side, like the body of a violin; fiddle-shaped; as, a panduriform leaf; panduriform color markings of an animal.

The perforation of a cavity of the body with a trocar, aspirator, or other suitable instrument, for the evacuation of effused fluid, pus, or gas; tapping.

The walls of a cavity or an organ; as, the abdominal parietes; the parietes of the cranium.

he chest in auscultation. It usually indicates some morbid change in the lungs or pleural cavity.

The calyx of a crinoid. Pelvis of the kidney (Anat.), the basinlike cavity into which the ureter expands as it joins the kidney.

Surrounding the branchiæ; as, a peribranchial cavity.

The primitive perivisceral cavity.

Surrounding the stomach; -- applied to the body cavity of Bryozoa and various other Invertebrata.

The smooth serous membrane which lines the cavity of the abdomen, or the whole body cavity when there is no diaphragm, and, turning back, surrounds the viscera, forming a closed, or nearly closed, sac. [Written also peritonæum.]

Around the viscera; as, the perivisceral cavity.

One of the filaments on the inner surface of the gastric cavity of certain jellyfishes.

Having an umbrella-shaped or bell-shaped body, with a wide, open cavity beneath; -- said of certain jellyfishes.

The part of the alimentary canal between the cavity of the mouth and the esophagus. It has one or two external openings through the nose in the higher vertebrates, and lateral branchial openings in fishes and some amphibias.

The cavity of a hydrophyllium.

A large cavity or hole in the ground, either natural or artificial; a cavity in the surface of a body; an indentation; specifically: