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Relating to the blastophore.

That portion of the spermatospore which is not converted into spermatoblasts, but carries them.

The pore or opening leading into the cavity of invagination, or archenteron.

The hollow globe or sphere formed by the arrangement of the blastomeres on the periphery of an impregnated ovum.

In certain hydroids, an imperfect zooid, whose special function is to produce medusoid buds. See Hydroidea, and Athecata.

pment of the ovum in which the outer cells of the morula become more defined and form the blastoderm.

Same as Blastula.

Affected by blasts; gusty.

Non-germinal.

Segmenting unequally; -- said of telolecithal ova with complete segmentation.

A crossbow. See Arbalest.

A hollow blastula, supposed to be the primitive form; a c

Same as Bioplast.

An embryonic cell which develops into a pigment cell.

One of the cells which, in the Coelenterata, develop into cnidæ.

The nucleus of a cell; the germinal or active spot of a cellule, through or in which cell development takes place.

See Protoplasm.

Characterizing the ovum when it has two primary germinal layers.

Applied to a form of egg cleavage seen in osseous fishes, which occurs only in a small disk that separates from the rest of the egg.

The outer layer of the blastoderm; the epiblast; the ectoderm.