In the Echinodermata nothing is unfortunately known as to the ontogeny of the generative organs and ducts.
This denture is nothing else than a phylogenetic incident in the ontogeny of the whale.
ontogeny, the history or study of the development of the individual, generally called embryology.
Their past (ontogeny) and present (pragmatics) are involved in these interactions.
Our ontogeny, Dr. Raye, is so simple that it can scarcely be said to exist at all.
This, however, had better also be deferred to the chapter on ontogeny.
Comparative anatomy, physiology, and ontogeny are of the first importance.
It relies on the facts of paleontology, and fills up the gaps in this by comparative anatomy and ontogeny.
Did this law not obtain, the ontogeny would lose much of the interest which it now possesses for us.
ontogeny teaches unmistakably that its elementary organs, the epidermic cells, develop entirely from the ectoderm.
ontogeny on·tog·e·ny (ŏn-tŏj'ə-nē)
The origin and development of an individual organism from embryo to adult. Also called ontogenesis.