. The Canadian naturalist and geologist. Natural history; Geology. Silurian and Devonian Fossils of Canada. 433 'Description.—Transversely oval; anterior and posterior extremi- ties rounded ; ventral margin moderately convex, dorsal margin a little more convex than the ventral; umbones rather small, incurv- ed ; greatest tumidity extending from the umbones obliquely to- wards the posterior ventral angle ; surface concentrically marked with fine striae and ridges of growth. Width one inch five lines ; length at the centre, one inch. Locality and Formation.—The specimens are from an island in th
. The Canadian naturalist and geologist. Natural history; Geology. Silurian and Devonian Fossils of Canada. 433 'Description.—Transversely oval; anterior and posterior extremi- ties rounded ; ventral margin moderately convex, dorsal margin a little more convex than the ventral; umbones rather small, incurv- ed ; greatest tumidity extending from the umbones obliquely to- wards the posterior ventral angle ; surface concentrically marked with fine striae and ridges of growth. Width one inch five lines ; length at the centre, one inch. Locality and Formation.—The specimens are from an island in the group lying off Point Palladeau, Lake Huron, where they were found associated with Chazy, Black River and Trenton fossils ; al- so at Point Claire, Island of Montreal. Collector—A. Murray. Cyrtodonta subcarinata (Billings). 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, Dawson
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