. Bulletin - United States National Museum. Science. 236 120, UNITED STATES NATIONAL MUSEUM. than in O. mriarum. The species seems to be distinct, but to resemble 0. japonica. This resemblance between an eastern Asiatic form and a western American form will be noted in our discussion of geo- graphical distribution as probably indicating a late migration from Siberia to Alaska and south between the mountains and the Pacific ocean. Opalina draytonil seems clearly to belong in the group Opalinae latac. Avhich is an Eastern Hemisphere a. Please note that these images are extracte
. Bulletin - United States National Museum. Science. 236 120, UNITED STATES NATIONAL MUSEUM. than in O. mriarum. The species seems to be distinct, but to resemble 0. japonica. This resemblance between an eastern Asiatic form and a western American form will be noted in our discussion of geo- graphical distribution as probably indicating a late migration from Siberia to Alaska and south between the mountains and the Pacific ocean. Opalina draytonil seems clearly to belong in the group Opalinae latac. Avhich is an Eastern Hemisphere a. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off.
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