The Neptunea lyrata (Gmelin, 1791) species complex in the Northeastern Pacific Ocean is examined, six species are recognized, including three new species Neptunea willetti spec. nov., and Neptunea cincticula spec. nov. herein described. The misunders

The large eastern Pacific Turbinidae, Megastraea rupicollina (Stohler, 1959) and the fossil M. petrothauma (Berry, 1940) were treated by McLean (1970) as junior synonymies of M. turbanica (Dall, 1910). This paper focuses on M. rupicollina and M. turbanica, but includes M. undosa (Wood, 1828) and the fossil M. petrothauma. Holotypes of three of these species are illustrated, the location of the M. undosa holotype is unknown, a comparative diagnosis of the above four taxa is provided, and a historical prospective presented. Megastraea rupicollina and M. undosa are the species harvested commercially on the west coast of the Baja California peninsula, not M. turbanica. Based on information presented, Megastraea rupicollina is returned to species status. Based on the type series of M. petrothauma and diagnosis, it is also returned to full species status. In addition, a summary in Spanish is provided