...It is interesting andimportant, as showing the tendency inthis highest group of Acalephs to assume a bilateral character...
Elizabeth Cabot Cary Agassiz 「Seaside Studies in Natural History」
...Another basis for classification in this type, which gives the same result,is the indication of a bilateral symmetry in some of the orders...
Elizabeth Cabot Cary Agassiz 「Seaside Studies in Natural History」
...To the second great group of the metazoa I gave the name of thecœlomaria, or bilaterata (or the bilateral higher forms)...
Ernst Haeckel 「The Evolution of Man」
...Apart from this bilateral structure, the gastrula of the amphioxus resemblesthe typical archigastrula of the lower animals (Figs...
Ernst Haeckel 「The Evolution of Man」
...This oval, uni-axial cup-larva (circular in section) becomes bilateral (ortri-axial) by the growth of a couple of cœlom-pouches from the primitive gut(Figs...
Ernst Haeckel 「The Evolution of Man」
...This embryonic form, the bilateral cœlomula (Fig...
Ernst Haeckel 「The Evolution of Man」
...At the same time, we can already trace thecharacteristic bilateral form of the body, the antithesis of right and left,before and behind...
Ernst Haeckel 「The Evolution of Man」
...The complete bilateral symmetry of the vertebrate body is very early indicatedin the oval form of the embryonic shield (Fig...
Ernst Haeckel 「The Evolution of Man」
...Its bilateral and tri-axial type indicates that the Gastræads—the commonancestors of all the Metazoa—divided at an early stage into two divergentgroups...
Ernst Haeckel 「The Evolution of Man」
...Thus arose the typical bilateral form,which has three axes...
Ernst Haeckel 「The Evolution of Man」
...The same bilateral type is found in all our artificialmeans of locomotion—carts, ships, etc...
Ernst Haeckel 「The Evolution of Man」
...Hence naturalselection early developed this bilateral type in a section of the Gastræads,and thus produced the stem-forms of all the bilateral animals...
Ernst Haeckel 「The Evolution of Man」
...On these principles I assume that the oldest and simplest Turbellaria arosefrom Platodaria, and these directly from bilateral Gastræads...
Ernst Haeckel 「The Evolution of Man」
...These primitive sexual cells (progonidia) are symmetricallyplaced to the right and left of the middle plane, like the two promesoblasts ofthe bilateral gastrula of the Amphioxus (Fig...
Ernst Haeckel 「The Evolution of Man」
...38) are also hermaphroditic primitive sexual cells in the same sense,inherited by this earliest vertebrate from its ancient bilateral gastræadancestors...
Ernst Haeckel 「The Evolution of Man」
..., on evolution, Bilateral symmetry, — — origin of, Bimana, Biogenetic law, the, Biogeny, Bionomy, Bird, evolution of the, — ovum of the, Bischoff, W...
Ernst Haeckel 「The Evolution of Man」
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