""A Contribution To The Embryology And Phylogeny Of The Pycnogonids"" is a scientific book written by Thomas Hunt Morgan and published in 1891. The book focuses on the embryology and phylogeny (evolutionary history) of the Pycnogonids, a group of marine arthropods commonly known as sea spiders. Morgan's research is based on the study of the development and anatomy of Pycnogonid larvae, as well as their relationships with other arthropod groups. He provides detailed descriptions and illustrations of the various stages of Pycnogonid development, including the formation of their characteristic long legs and proboscis. The book also includes a discussion of the evolutionary relationships between Pycnogonids and other arthropods, such as spiders, scorpions, and crustaceans. Morgan proposes a hypothesis for the origin and diversification of Pycnogonids, suggesting that they may have evolved from a primitive arthropod ancestor that lived in the ocean. Overall, ""A Contribution To The Embryology And Phylogeny Of The Pycnogonids"" is a seminal work in the field of marine biology and arthropod evolution, providing important insights into the development and evolutionary history of these fascinating creatures.This scarce antiquarian book is a facsimile reprint of the old original and may contain some imperfections such as library marks and notations. Because we believe this work is culturally important, we have made it available as part of our commitment for protecting, preserving, and promoting the world's literature in affordable, high quality, modern editions, that are true to their original work.