1. Fossils and Ancestors MacBride was an active Lamarckian and one of the last great exponents of the recapitulation theory.

2. 19) describes a specimen complete with both valves from Barton as being 'circular, rather longer than wide, very thin, not much convex, and presenting scarcely any trace of the Bisinuation--characteristic of the Lamarckian type.'

3. Spencer argued that both these theories were partial accounts of the truth: repeated associations of ideas were embodied in the formation of specific strands of brain tissue, and these could be passed from one generation to the next by means of the Lamarckian mechanism of use-inheritance.