. Acadian geology : the geological structure, organic remains, and mineral resources of Nova Scotia, New Brunswick, and Prince Edward Island. Geology -- New Brunswick; Geology -- Nova Scotia; Geology -- Prince Edward Island; Paleontology -- New Brunswick; Paleontology -- Nova Scotia; Paleontology -- Prince Edward Island. 604 THE UPPER SILURIAN. convex, scarcely gibbous; umbouial slope regularly convex, below which is a slight depression reaching to the postero-basal margin; posterior end rounded, the longer part of the curve on the basal side. Anterior end short and narrow, somewhat abruptly r
. Acadian geology : the geological structure, organic remains, and mineral resources of Nova Scotia, New Brunswick, and Prince Edward Island. Geology -- New Brunswick; Geology -- Nova Scotia; Geology -- Prince Edward Island; Paleontology -- New Brunswick; Paleontology -- Nova Scotia; Paleontology -- Prince Edward Island. 604 THE UPPER SILURIAN. convex, scarcely gibbous; umbouial slope regularly convex, below which is a slight depression reaching to the postero-basal margin; posterior end rounded, the longer part of the curve on the basal side. Anterior end short and narrow, somewhat abruptly rounded. Surface marked by regularly radiating rounded striae with faint concentric lines of growth. This differs from the preceding species in being less gibbous, in the more nearly parallel cardinal and basal lines in the direction of the umbonial ridge, and in the stronger radiating striae. Arisaig, East River, coll. J. W. D. Avicula Honeymanl, Hall (Fig. 210), Left valve: body of the shell obliquely ovate, convex and somewhat gibbous towards the umbo, anterior wung small rounded, posterior wing large triangular, obtuse at the extremity, extending two-thirds the length of the shell. The line between the wing and body of the shell well defined by a Fig. i\0.—Avkula slight abrupt depression along the junction. Surface marked by rounded radiating striaj which are interrupted by fainter concentric undulations or lines of growth; the wing is marked only by con- centric striae. This species bears some resemblance to A. emacerata of the Niagara and Clinton groups of New York ; but its form is slightly more oblique, and the wing is marked only by concentric striae, while in the New York species the radiating lines on this part are stronger than the concentric ones. Arisaig, coll. J. W. D. Grammysia triangidata^ Salter. Arisaig, Dr Honeyman. Grammysia chigulafa, Hisinger. Arisaig, Dr Honeyman. Pterinea retroflexa. Arisaig, Dr Honeyman. Goniophora cymhaeformis, Sow. Arisa
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