. The geology of Nova Scotia, New Brunswick, and Prince Edward Island, or, Acadian geology [microform]. Geology; Geology, Stratigraphic; Paleontology; Geology, Economic; Géologie; Géologie stratigraphique; Paléontologie; Géologie économique. Ml i m- ] 604 THE UPPER SILURIAN. convex, scarcely gibbous; umbonlal slope regularly convex, below which is a slight depression reaching to tiie 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 fain
. The geology of Nova Scotia, New Brunswick, and Prince Edward Island, or, Acadian geology [microform]. Geology; Geology, Stratigraphic; Paleontology; Geology, Economic; Géologie; Géologie stratigraphique; Paléontologie; Géologie économique. Ml i m- ] 604 THE UPPER SILURIAN. convex, scarcely gibbous; umbonlal slope regularly convex, below which is a slight depression reaching to tiie 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 Honeymani, Hall (Fig. 210). Left valve: body of the shell obliquely ovate, convex and somewhat gibbous towards the umbo, anterior wing 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. 210.—At^icula slight abrupt depression along the junction. Surface marked by rounded radiating striae 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. Chrammysia triangulata, Salter. Arisaig, Dr Honeyman. Grammysia cingulata, Hisinger. Arisaig, Dr Honeyman. Pterinea retroflexa. Arisaig, Dr Honeyman. Goniophora cymbaeforinis, Sow. Arisaig, Dr Honeyman. This and the three last shells I give on the
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Keywords: ., boo, bookcentury1800, booksubjectgeology, booksubjectpaleontology
