""A Contribution to the Embryology and Phylogeny of the Pycnogonids"" is a scientific study written by Thomas Hunt Morgan and published in 1891. The book focuses on the embryonic development and evolutionary history of the Pycnogonids, a group of marine arthropods also known as sea spiders. Morgan's research is based on his observations of the development of Pycnogonid embryos, as well as his analysis of the morphology and anatomy of adult specimens...