Cov' ert, a feather overlying the base of the large feathers of the wing or tail.
Cra' ni um, the skull, particularly that part of it inclosing the brain.
Crop, an enlarged portion of the esophagus.
Cross fertilization, a form of fertilization in which the male and female elements are produced by different individuals.
Crus ta' ce a, aquatic, gill-bearing arthropods, with two pairs of antennæ.
Cu' ti cle, the thin outer skin.
Cy' to plasm, the portion of the protoplasm of a cell which is outside of the nucleus, less dense than the nucleus and usually taking a lighter stain.
Den' ta ry, the terminal portion or bone of the lower jaw of vertebrates lower than mammals, containing all or most of the teeth.
Di a phragm, a muscular partition separating the abdomen and thorax, in mammals.
Dig' i ti grade, walking on the toes.