Several fossil or subfossil avian forms, very interesting from the point of view of geographical distribution, have been discovered by Dr H.
Lindsay, " On' the Avian Sternum," P.Z.S., 1885; E.
As in the case of plants, western, eastern, northern and southern avian species meet in Nebraska.
Schaudinn had fully described the relations of certain avian Trypanosomes to their invertebrate host, Culex pipiens (females).
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.
- Representative Mammalian, Avian and Reptilian Trypanosomes, to illustrate the chief morphological characters.
Garrod, who said, " The screamers must have sprung from the primary avian stock as an independent offshoot 1 Hence J.
Thus, for instance, the archecentric condition of any Avian structure is a metacentre of the Sauropsidan stem.
Ziemanni and Trypanomorpha noctuae, among avian parasites, described by Schaudinn (50); Trypanosoma inopinatum, among batrachian forms, described by A.
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.