. Annual report. New York State Museum; Science; Science. SOME NEW DEVONIC FOSSILS 227 the valves obliquely backward though without greatly affecting the regularity of the basal margin. Umbonal ridge sharply devel- oped, not crested; extending to the postlateral angle. Postum- bonal slope broad and concave, its outer edge constituting the entire posterior margin of the valve which slopes forward to the hinge. This concave area is traversed by an obscure radial ridge. Surface of the valves covered with fine concentric striae in low and irregular undulations over the shell body; these however ar
. Annual report. New York State Museum; Science; Science. SOME NEW DEVONIC FOSSILS 227 the valves obliquely backward though without greatly affecting the regularity of the basal margin. Umbonal ridge sharply devel- oped, not crested; extending to the postlateral angle. Postum- bonal slope broad and concave, its outer edge constituting the entire posterior margin of the valve which slopes forward to the hinge. This concave area is traversed by an obscure radial ridge. Surface of the valves covered with fine concentric striae in low and irregular undulations over the shell body; these however are absent on the posterior slopes where sharp concentric lines alone are visible. Length about one third the hight. Lower Devonic. Dalhousie, N. B. Carydium elongatum nov. This is distinguished from its associate C. gregarium Beus- hausen by its longer and narrow valves which are quite regularly convex from a transverse median line, the surface sloping thence uniformly above and below, leaving the umbones depressed. The. 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 : University of the State of New York
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectscience, bookyear1902
