. The Canadian field-naturalist. Natural history. 66 The Ottawa Naturalist. (July formis of Meek and Hayden, from the Jurassic rocks of the Black Hills of Dakota, that was first described in 1858, is evidently a typical Cardioceras. Three years ago, in June, 1900, Mr. James McEvoy who was then on the staff of the Geological Survey, discovered a small specimen of an Ammonite, that appears to be a true Cardioceras^ from a coarse grit near the top of a ridge running N. 20° E. and situated two miles and a quarter N. 70° E. from Fernie, , about 4,000 feet above the sea level. The specimen is on
. The Canadian field-naturalist. Natural history. 66 The Ottawa Naturalist. (July formis of Meek and Hayden, from the Jurassic rocks of the Black Hills of Dakota, that was first described in 1858, is evidently a typical Cardioceras. Three years ago, in June, 1900, Mr. James McEvoy who was then on the staff of the Geological Survey, discovered a small specimen of an Ammonite, that appears to be a true Cardioceras^ from a coarse grit near the top of a ridge running N. 20° E. and situated two miles and a quarter N. 70° E. from Fernie, , about 4,000 feet above the sea level. The specimen is only a natural hollow mould of the exterior of a shell that is imperfect at the aperture and about thirty-two millimetres, or an inch and a quarter, in its maximum diameter. But, this mould is so sharply defined that good white gutta percha impressions of it, or '' squeezes " from it, show both the shape and surface markings of the whole of one side of the fossil and of part of the other, remarkably well. These impressions indicate the immature stage of a species of Cardioceras that seems to be very closely related to the Euro- pean C. cordatum, but that may be provisionally named and de- scribed as follows. Cardioceras Canadense, nom. 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 Ottawa Field-Naturalists' Club. Ottawa
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