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Implacental, im-pla-sen′tal, adj. having no placenta, as certain marsupial animals.

Didelphia, dī-del′fi-a, n.pl. the marsupialia, or marsupial implacental mammals, one of the three sub-classes of Mammalia.—adjs.

On land, all the indigenous mammals, except bats, belong to the lowest, or implacental division; and the insects are singularly different from those found elsewhere.

Again, the implacental mammals, including the Ornithodelphia and the Marsupials, are admitted to be lower than the placental series.

Chances against concordant variations.—Examples of discordant ones.—Concordant variations not unlikely on a non-Darwinian evolutionary hypothesis.—Placental and implacental mammals.—Birds and reptiles.—Independent origins of similar sense organs.—The ear.—The eye.—Other coincidences.—Causes besides Natural Selection produce concordant variations in certain geographical regions.—Causes besides Natural Selection produce concordant variations in certain zoological and botanical groups.—There are homologous parts not genetically related.—Harmony in respect of the organic and inorganic worlds.—Summary and conclusion ...