. Annual report. New York State Museum; Science; Science. 172 NEW YORK STATE MUSEUM from the body of the shell, extremity rather pointed, posterior margin sinuate in joining the shell. Both ears ornamented by radiating striae crossed by striae which, on the anterior ear, are sharp and high, giving it a cancellated appearance. The sculpturing of the shell is somewhat similar to that of the ear. The radiating costae two ranked, the smaller ones interpolated between the larger, 37 in all, crossed by concentric lamellae which are highly vaulted on crossing the ridges as shown in the molds. Ridges
. Annual report. New York State Museum; Science; Science. 172 NEW YORK STATE MUSEUM from the body of the shell, extremity rather pointed, posterior margin sinuate in joining the shell. Both ears ornamented by radiating striae crossed by striae which, on the anterior ear, are sharp and high, giving it a cancellated appearance. The sculpturing of the shell is somewhat similar to that of the ear. The radiating costae two ranked, the smaller ones interpolated between the larger, 37 in all, crossed by concentric lamellae which are highly vaulted on crossing the ridges as shown in the molds. Ridges rather sharp and about as broad as the furrows except on posterior region where the latter are wider. F. * Aviculopecten lyelli Dawson. Above, two left valves and one right; below, enlargements of the hinge. Cape le Trou, Grindstone I. Dimensions. Length of hinge, mm5 length of shell, 17 mm: height, 19 mm; 6 or 7 striae in 5 mm; angle of beak about 900. Remarks. The specimens figured and described here are some- what undersized. They are closely related to a species from the Knobstone of Indiana but differ in the relative breadth of the ribs, size of the shell, etc. There is a cavity beneath the beaks of our casts, but it is difficult to determine its true character. Aviculopecten acadicus Hartt? Cf. Aviculopecten acadicus Hartt. Dawson's Acadian Geolog}^, p. 307, fig. 114, 1878. Shell small, convex; ears not well developed; beak sharply pointed. Anterior ear sharply separated from the shell, posterior ear not so distinct from it. About 25 radiating costae are shown, separated by wide interspaces and crossed by concentric lines or laminae which are raised on the costae making them appear nodose or the shell 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 New York State Museum. Albany : Un
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectscience, bookyear1902
