tape'tum

[L. a carpet.] i. Membrana versicolor of Fielding, a stratum formed by the commi ural fibers of the body and upper part of the splenium of the corpus callosum, bending round the lateral ventricle. 2. In botany a cell, or layer of cells, surrounding the archesporiimi, and becoming absorbed as the spores develop, t. alve'oli, alveolar periosteum, t. cellulo's um, t. choriold'ea, t. coat of the eye in certain of the carnivorous animals, giving the shining appearance seen in the cat's eyes in the dark. t. cor'por is callo'si, a. band of white fibers pa ing from the corpus callosum to the temporal lobe over the middle comu of the lateral ventricle, t. fibro's um, a layer of wavy connective-ti ue fibers in the choroid coat of the eye of grazing animals, giving a metallic hue to the eye. t. lu'cidum, t. cellulosum. t. nigrum, t. oc'uli, the pigment layer of the retina, t. ventric'uli, a bundle of white fibers running from the cortex of the frontal lobe to that of the occipital lobe.