The present report concerns itself with members of the family Spionidae (polychaetous annelids) from California. The collections originate from different sources. Most were made by the author over a period of years; when they are from other sources, recognition is made. Most of the larval stages reported on were taken from the pier of the Scripps Institution of Oceanography at La Jolla during the spring of 1938; some collections were made in southern California during the author's tenure at the Allan Hancock Foundation of The University of Southern California. The types of new species are deposited in the Allan Hancock Foundation.