Tillyard's important paper on the structure of 'caudal gills' is almost unobtainable yet remains an essential reference for workers on Odonata. As a first step here is a facsimile of the text and figures in .xif format. This is an efficient high compression format. Although the aesthetics of the original are diminished the all important content is available. Internally text is compressed separately from figures. Figures were recorded at 300dpi so they easily withstand examination at 200% magnification (see example at the bottom of this page). I find it easiest to read with magnification set at 125 or 150 (type this into the magnification box in the top bar of the viewer).
While over 80 years have passed since this paper was prepared it has lost
little in that time. A most important aspect of the work is that it is a broad
comparative study and contained a wealth of new material. Despite advances in
technology almost no comparable work has been done since.
NOTE: Tillyard used the terminology 'gills' without presuming function. This is
discussed early in the paper.
Please right-click (or other) and download the files for local
reading, rather than messing about over a long link.
The .pdf file is slightly coarser in my viewer but the pictures clean up if you
use the zoom tool to expand them (this had me worried, but the information is
there).
NOTE: these are all graphics files (pictures of the pages) and cannot be machine-searched.
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