. Bulletin - New York State Museum. Science. SOME NEW DEVONIC FOSSILS 283 of Sowerby's well known Upper Siliiric Orthis hybrida. In its immature stages it is essentially that shell; at full growth. Rhipidomella hybridoides its characters have changed by progression and indicate thereby a Postsiluric age. Loiver Devonic. Dalhousie, N. B. Rhipidomella numus nov. A shell directly comparable to R. (Orthis) oblata Hall of the Helderberg fauna, agreeing therewith in form and contour of valves though perhaps never attaining the size of that species. It differs therefrom: (i) in the slightly greater l
. Bulletin - New York State Museum. Science. SOME NEW DEVONIC FOSSILS 283 of Sowerby's well known Upper Siliiric Orthis hybrida. In its immature stages it is essentially that shell; at full growth. Rhipidomella hybridoides its characters have changed by progression and indicate thereby a Postsiluric age. Loiver Devonic. Dalhousie, N. B. Rhipidomella numus nov. A shell directly comparable to R. (Orthis) oblata Hall of the Helderberg fauna, agreeing therewith in form and contour of valves though perhaps never attaining the size of that species. It differs therefrom: (i) in the slightly greater length of hinge, but principally (2) in the very much coarser and sparser plication of the surface. In R. oblata the radial striae are fine and crowded; in a typical example I find about 70 at a distance of 10. 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; New York State Museum. Albany : New York State Education Dept
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectscience, bookyear1887
