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Entoblast; endoplast. See Nucleus,

Relating to the endoblast; as, the endoblastic layer.

The inner germ layer; endoderm. See Nucleolus.

The granule within the nucleolus or entoblast of a nucleated cell. Agassiz.

The outer layer of the blastoderm; the ectoderm. See Blastoderm, Delamination.

Of or relating to, or consisting of, the epiblast.

A reproductive bud of a hydroid; a simple gonophore.

A blastostyle.

The Athecata; -- so called because the medusoid buds are not inclosed in a capsule.

Of or pertaining to the Gymnoblastea.

One of the very minute, disk-shaped bodies found in blood with the ordinary red corpuscles and white corpuscles; a third kind of blood corpuscle, supposed by some to be an early stage in the development of the red corpuscles; -- called also blood plaque, and blood plate.

an ovum composed entirely of germinal matter. See Meroblast.

entirely of germinal matter, the whole of the yolk undergoing fission; -- opposed to meroblastic.

See under Blast.

The inner or lower layer of the blastoderm; -- called also endoderm, entoderm, and sometimes hypoderm. See Illust. of Blastoderm, Delamination, and Ectoderm.

Relating to, or connected with, the hypoblast; as, the hypoic sac.

An individual cell, differing greatly from its neighbours in regard to size, structure, or contents.

nsisting of both a germinal portion and an albuminous or nutritive one; -- opposed to holoblast.

ting only in part of germinal matter; characterized by partial segmentation only; as, meroblastic ova, in which a portion of the yolk only undergoes fission; meroblastic segmentation; -- opposed to holoblastic.

The mesoderm.