Cyphonautes larva. The larva of a polyzoan, similar to a trochosphere with a bivalve shell.

Cypsela. Characteristic fruit of the family Compositae (sun-flower, daisy, etc.). Like an achene (and usually so described) but formed from an inferior ovary and thus sheathed with other floral tissues outside ovary wall. Strictly a pseudo-nut as it is formed from two carpels.

Cyst.
Under unfavourable conditions some protests from hard and thick covering around the protoplasm of the cell. This tough covering is called the cyst.

Cymose.
Having growing parts that end in flowers, as a result of which the combined growth depends on the production of lateral growing point; the older part of inflorescence is thus at apex.

Cytoplasmic inheritance. Non-mendelian (extra-chromosomal) inheritance by self-propagating cytoplasmic entities; as distinct from gene inheritance.

Cytosol. Biochemical term for the soluble part of the cytoplasm when all cell organelles and other particles have been removed by centrifugation.

Cytosome.
A mothy-like opening present in many unicellular organisms.