In many cases, at any rate, this indicates a difference in sexuality; and it is particularly necessary to bear this factor in mind when considering the avian Trypanosomes, where, perhaps, the extremes of form are to be met with.
In view, however, of the great interest excited by Schaudinn's work on avian parasites, as well as on account of the far-reaching importance of his conclusions to the study of the Haematozoa, a brief summary of his celebrated research is necessary.
As in the case of plants, western, eastern, northern and southern avian species meet in Nebraska.
Schaudinn (50), who investigated certain avian Trypanosomes, considered the latter view to be correct, and believed that the carrier - in this instance a gnat - is indeed the definitive host, i.e.
Thus, for instance, the archecentric condition of any Avian structure is a metacentre of the Sauropsidan stem.
Schaudinn had fully described the relations of certain avian Trypanosomes to their invertebrate host, Culex pipiens (females).
Several fossil or subfossil avian forms, very interesting from the point of view of geographical distribution, have been discovered by Dr H.
Ziemanni and Trypanomorpha noctuae, among avian parasites, described by Schaudinn (50); Trypanosoma inopinatum, among batrachian forms, described by A.
Schaudinn has stated, however, that Trypanomorpha becomes, in certain phases, attached to a red blood-corpuscle (ectoglobular), and, in others, penetrates inside one and eventually destroys it (endoglobular); while his other avian parasite, Trypanosoma ziemanni, apparently draws up into itself the white corpuscle (leucocyte) to which it becomes attached.