It has been my privilege, during a long series of years, to spend the summer months at the laboratory of the United States Bureau of Fisheries, at Woods Hole, Mass. During that time considerable attention was given to a study of the distribution of the helminth parasites of fishes. Through the cooperation of the late Vinal N. Edwards, collections and observations were made so as to cover all the months of the year. All collections in the months of October to May, inclusive, and the greater number of those in June and September, were made by Mr. Edwards. The majority of the collections in July and August, and a few of those in June and September, were made by the author. Reports on a few trematodes from fishes not of the Woods Hole region are herein included. When not stated otherwise it is to be understood that digenetic forms came from the intestine and monogenetic forms from the gills. In many cases in which the same species of trematode is accredited to more than one species of fish, measurements are given of examples from different hosts, and record made of differences noted.
LI ns on the specimens. I was thus c-uibied to collect much ini in the short time at my disposal than would have been possil without this assistance. It may not he ann'ss to give hore. for flic ben >6t '-ctors, the * Botliriocephaliis tumiduliis Rnd., B. Echeneis Lenckart, Petalocephalus tuiniduliis 9 Van Lith de Jeude, Tetraboihrium tumidithtm Rud. Dies, and Echeneibothrium tinnidulum Beueden, Dies.
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