. The Canadian record of science. Natural history. Fig. 6. Cross section of canals, injected with serpentine, highly magnified. in different organic substances. As an example, I have already mentioned that in some of the specimens a white flocculent serpentine encroaches upon the calcareous walls or in part replaces them. This would indicate the partial removal of the calcite prior to or at the same time with the filling. In some cases also the calcite wall is wholly or in part replaced with dolomite. Such changes are not infre- quent in Palaeozoic fossils in which the substance of a cal- care
. The Canadian record of science. Natural history. Fig. 6. Cross section of canals, injected with serpentine, highly magnified. in different organic substances. As an example, I have already mentioned that in some of the specimens a white flocculent serpentine encroaches upon the calcareous walls or in part replaces them. This would indicate the partial removal of the calcite prior to or at the same time with the filling. In some cases also the calcite wall is wholly or in part replaced with dolomite. Such changes are not infre- quent in Palaeozoic fossils in which the substance of a cal- careous part has often been wholly removed and replaced by another mineral or has been partially eroded and so in part Fig. 7. Longitudinal section of canals, highly magnified. There are other peculiarities deserving special notice :—. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Natural History Society of Montreal. Montreal, Natural History Society
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