. Annual report of the regents of the university of the state of New York on the condition of the State Cabinet of Natural History and the historical and antiquarian collection annexed thereto. Science. No. 109.] 67 specimens wouU probably show fine concentric lines; but those hitherto found, have such markings only near the margins of the valves. As is usual in this type o^ Rhynchonella, there is on each side of the plications on the front of the shell a faint longitudinal impressed line. In forih and general aspect this species varies greatly, being sometimes or oblong,
. Annual report of the regents of the university of the state of New York on the condition of the State Cabinet of Natural History and the historical and antiquarian collection annexed thereto. Science. No. 109.] 67 specimens wouU probably show fine concentric lines; but those hitherto found, have such markings only near the margins of the valves. As is usual in this type o^ Rhynchonella, there is on each side of the plications on the front of the shell a faint longitudinal impressed line. In forih and general aspect this species varies greatly, being sometimes or oblong, in others globose to subpentagonal. The extremes of these varieties, without the intermediate forms, would appear to present well-marked specific dificrences; but a careful study of the series shows such an imperceptible gradation of form as to leave little doubt of their identity. Geological position and locality. Pentamerus limestone of the Lower Helderbcrg group, Albany and Schoharie EHYNCnONELLA 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, Regents of the University of the State of New York
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectscience, bookyear1853
