from Allan Hancock Pacific and Caribbean Sea Expeditions

lectotype designations; paralectotype designations; systematics; taxonomy. Hydroids of the Allan Hancock Pacific Expeditions, and those of the Allan Hancock Caribbean Sea Ex-pedition, were examined by Charles McLean Fraser in a series of reports published between 1938 and 1948. A total of 159 new nominal species was described from material collected in the eastern Pacific between Peru and southern British Columbia. Accounts of an additional five nominal species were based on specimens from the southern Caribbean Sea. No valid holotypes were designated in accord-ance with provisions of the International Code of Zoological Nomenclature for any of these taxa. The purpose of this report is to establish an objective standard for each species, and to promote stability of nomenclature in Hydrozoa, by designating lectotypes for these taxa, or in a few cases by recognizing a holotype by monotypy, based largely on specimens in the Allan Hancock Hydroid Collections at the Santa Barbara Museum of Natural History. One lectotype colony is in the C.M. Fraser Hydroid Collec-tion at the Royal British Columbia Museum. Paralectotype material was also designated for most of th