 To distinguish these two meanings of relationship, Owen introduced into the literature a crucial distinction between resemblances of “homology”, meaning the presence of the “same” parts in every variety of form and function—Geoffroyean relationships—and those of “analogy”, denoting solely the similarity of parts in their functional adaptations—Cuvierian relationships. Developing this concept of homology in relation to his theory of the archetype, Owen claimed he could at last give a coherent meaning to the concept of “sameness” in anatomical relationships. Furthermore, as Owen developed this theory in relation to his work on the fossil record, the theory of the archetype, conceived also as an immanent law working in history, led Owen to embrace a concept of branching and diversifying relations of forms as divergences from this ideal archetypal form over time. Owen thus broke with the linear historical progressionism from simple to complex assumed in transformist theories like those of Lamarck, particularly in Lamarck’s writings before 1815. He also distinguished this kind of historical relationship from that advocated by some of the German proto-transformists who developed their ideas on linear models.