. The Canadian naturalist and geologist. Natural history; Geology. 440 Silurian and Devonian Fossils of Canada. impression sub-circular, superficial and situated just beneath the posterior extremity of the hinge line. The specimen is deeply imbedded in a coral [Monticulipora petropolitana), and only exhibits the edges and inside of the shell. From the great thickness of the shell, casts of the interior must bear very little resemblance to a perfect specimen. The form is very like that of Vanuxemia inconstans, but the characters of the interior leave no doubt as to its distinctness. Locality an
. The Canadian naturalist and geologist. Natural history; Geology. 440 Silurian and Devonian Fossils of Canada. impression sub-circular, superficial and situated just beneath the posterior extremity of the hinge line. The specimen is deeply imbedded in a coral [Monticulipora petropolitana), and only exhibits the edges and inside of the shell. From the great thickness of the shell, casts of the interior must bear very little resemblance to a perfect specimen. The form is very like that of Vanuxemia inconstans, but the characters of the interior leave no doubt as to its distinctness. Locality and Formation.—Bayfield Sound, Lake Huron a sin- gle loose specimen; Lower Silurian ; appears to be of the Hudson River Group. Collector.—A. Murray. Genus Matheria (Billings). Generic Characters.— Transverse ; equivalve ; inequilateral; beaks near the anterior end ; dorsal and ventral margins sub- parallel; two small obtuse cardinal teeth in the left valve, and one in the right; no lateral teeth; two muscular impressions' ligament external. This genus is dedicated to Mather, one of the Geologists of the New York Survey. Matheria Fig. 18. Figure 18. A, dorsal view of Matheria tener ; B, interior of right valve ; C, exterior of left valve ; D, interior of left valve. Description.—Small, oblong, depressed; dorsal and ventral margins nearly straight and parallel ; upper half of posterior extremity obliquely truncate; lower half rounded; anterior extremity sub-truncate from the beaks nearly to the anterior ven- tral angle, which is rounded, and projects slightly beyond the umbones. From the beaks to the anterior ventral ansle extends. 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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