SUMMARY: This paper deals with variability within certain species of the genus as revealed under the electron microscope. New varieties and two new species are described (), one of these having previously been considered a variety, partly through confusion. An attempt is made to consider different kinds of variability and to make a decision on what range can be tolerated within the limits of a species. The importance of examining the whole organism under the electron microscope as well as a few scales is now realized. It is desirable also to examine the flagellum since several species which have been described as belonging to the genus must be separated from it because they prove to have two flagella.


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