SACRAL. — Belonging to the sacrum, or the bone composed usually of two or more united vertebrae to which the sides of the pelvis in vertebrate animals are attached.

SARCODE. — The gelatinous material of which the bodies of the lowest animals (Protozoa) are composed.

SCUTELLAE. — The horny plates with which the feet of birds are generally more or less covered, especially in front.

SEDIMENTARY FORMATIONS. — Rocks deposited as sediments from water.

SEGMENTS. — The transverse rings of which the body of an articulate animal or annelid is composed.

SEPALS. — The leaves or segments of the calyx, or outermost envelope of an ordinary flower.