. Bulletin - United States National Museum. Science. 178 BULLETIN 120, UNITED STATES NATIONAL MUSEUM. Opalina ohtrigonoidea and its subspecies have a wide distribution from the whole Atlantic coast of North America to Alaska and Cen- tral America. It is likely that breeding experiments, if possible to i. Fio. 143.—Opalina obtkigonidea, from Bufo fowlbri, x 117 diametbes. carry out, would elevate to specific rank some of the forms here treated as subspecies, but their structure alone is not sufficient to demarcate them as species. The species ohtrigonoidea is differen- tiated from 0. ohtrigona
. Bulletin - United States National Museum. Science. 178 BULLETIN 120, UNITED STATES NATIONAL MUSEUM. Opalina ohtrigonoidea and its subspecies have a wide distribution from the whole Atlantic coast of North America to Alaska and Cen- tral America. It is likely that breeding experiments, if possible to i. Fio. 143.—Opalina obtkigonidea, from Bufo fowlbri, x 117 diametbes. carry out, would elevate to specific rank some of the forms here treated as subspecies, but their structure alone is not sufficient to demarcate them as species. The species ohtrigonoidea is differen- tiated from 0. ohtrigona by its greater diversity in form, not only between different infections, but between different individuals in 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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