. Allan Hancock Pacific expeditions. [Reports]. Scientific expeditions. DISTRIBUTION OF THE HYDROIDS IN THE COLLECTIONS OF THE ALLAN HANCOCK EXPEDITIONS C. McLean Fraser Three papers on the Hancock hydroids have appeared, one on those collected in 1934, one on those in 1936 and 1937, and one on those in 1932, 1933, 1935, and 1938. In the first paper some attention was given to general distribution; in the other two little consideration was given to it, apart from the distribution records. Since several species are re- corded in these two papers that were not in the first one, it may be an oppo
. Allan Hancock Pacific expeditions. [Reports]. Scientific expeditions. DISTRIBUTION OF THE HYDROIDS IN THE COLLECTIONS OF THE ALLAN HANCOCK EXPEDITIONS C. McLean Fraser Three papers on the Hancock hydroids have appeared, one on those collected in 1934, one on those in 1936 and 1937, and one on those in 1932, 1933, 1935, and 1938. In the first paper some attention was given to general distribution; in the other two little consideration was given to it, apart from the distribution records. Since several species are re- corded in these two papers that were not in the first one, it may be an opportune time to review the situation to date, in the area covered by the expeditions, viz., the east coast of the Pacific from the northern boundary of Mexico to the southern boundary of Peru, and the Oceanic islands related to this area. Before 1932, when the first Hancock hydroids were collected, very little was known of the hydroid fauna of this area. In 1891, the United States Fish Commission Steamer Albatross did some dredging off the Mexican and Central American coasts and S. F. Clarke recorded ten species from the material, all within one hundred miles of Panama, except one from the coast of Nicaragua. In 1904 and 1905, the Albatross did some dredging at widely distant stations in this general area and from the material Clarke recorded twelve species. Two species were common to the two collections, so there were 20 recorded in all. These were: Eudendrium sp. Pennaria pacifica Clarke Campanularia obliqua Clarke .y^^nV^'^ Obelia castellata Clarke ' ""'' Obelia striata Clarke Obelia sp. Campanulina denticulata Clarke Halecium argenteum Clarke Halecium gracile Bale Acryptolaria conferta (Allman) Acryptolaria pulchella (Allman) Lafoea convallaria Allman Lafoea gracillima (Alder) Lictorella geniculata Clarke [ 155 ]. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of
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