. The Canadian record of science. Natural history. 304 Canadian Record of Science. According to the researches of Froelich,* the methyl groups in pseudo-cumidine, occupy the positions 2, 4 and 5, the amido group being 1. There are thus only the positions 3 and 6 left for the ethyl groups to fill. The constitutional formula for the base is therefore— NIL C2H5. CEL On the occurrence of Scolithus in Rocks of the Ohazy Formation about Ottawa, Ontario. By Henry M. Ami, , For years past, the occurrence of Scolithus in the lower portion of the Cambro-Silurian or Ordovician strata, as it is
. The Canadian record of science. Natural history. 304 Canadian Record of Science. According to the researches of Froelich,* the methyl groups in pseudo-cumidine, occupy the positions 2, 4 and 5, the amido group being 1. There are thus only the positions 3 and 6 left for the ethyl groups to fill. The constitutional formula for the base is therefore— NIL C2H5. CEL On the occurrence of Scolithus in Rocks of the Ohazy Formation about Ottawa, Ontario. By Henry M. Ami, , For years past, the occurrence of Scolithus in the lower portion of the Cambro-Silurian or Ordovician strata, as it is developed in the St. Lawrence and Ottawa Valleys, as well as in the State of New York and elsewhere, was almost invariably taken as the best indication of the pre- sence of the Potsdam formation. Scolithus Canadensis, as described by the late Mr. E. Billings in his first volume of the Palseozoic Fossils, p. 96, was shewn to be eminently characteristic of the Potsdam formation, its occurrence in a number of localities having been recorded by him. Since then it has also been found in rocks of the same horizon in various other localities, and well recognized by geologists in general. The form Scolithus linearis, of Hall, is also referred to by Mr. Billings, as occurring in the measures of the Potsdam, as seen at L'Anse au Loup (Joe. cit. p. 2), but in no other Cambrian or Ordovician formation have the remains of Scolithus been recognised as yet, as far as the writer is aware. * Berichte, xvii, 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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