. The Canadian journal of industry, science and art. 358 THE DEVONIAN FOSSILS OF CANADA WEST. of the margia below. The greatest width (which is at mid-length, and nearly at right angles to the greatest length) is one inch and three quarters. Depth of both valves, at a little above the middle, one inch and a half. The umbones are elevated nearly half an inch above the hinge-line. The whole shell is pretty evenly convex, with a slight approach to a concave slope in front of the umbones. There appears to be an area, but our specimens do not shew it with sufficient clearness to warrant a positive
. The Canadian journal of industry, science and art. 358 THE DEVONIAN FOSSILS OF CANADA WEST. of the margia below. The greatest width (which is at mid-length, and nearly at right angles to the greatest length) is one inch and three quarters. Depth of both valves, at a little above the middle, one inch and a half. The umbones are elevated nearly half an inch above the hinge-line. The whole shell is pretty evenly convex, with a slight approach to a concave slope in front of the umbones. There appears to be an area, but our specimens do not shew it with sufficient clearness to warrant a positive opinion. This species is dedicated to the discoverer, W. &. Tomkins, Esq., C. E. St. Mary's, Canada West. Locality and Formation.—Corniferous Limestone, St. Mary's. Collector.—W. G. Tomkins. Gasteropoda.—( We have in the Devonian Rocks of Canada West about 25 species of Gasteropoda of the genera Euomphalus, Straparollus. Murchisonia, Pleurotomaria, Loxonema, Macrocheilus, Platyostoma and Platyceras, Of these I shall only notice the following at present. Euomphalus De Cewi.—N. 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 Canadian Institute. Toronto : Canadian Institute
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