Adequate study of anatomy of most Paleozoic Bryozoa, particularly the classic Cincinnatian (Late Ordovician) faunas, requires preparation of a minimum of two or three oriented thin sections per specimen. To save time, cellulose acetate slides are being used to make dry peels or replicas of oriented polished sections for preliminary study. Procedure for making the impressions directly into the cellulose acetate slide is outlined. A microslide projector is used to save time in making large numbers of measurements, and a file of study photographs facilitates comparison of many specimens in a short time.

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