. 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. 178 [Senate This shell in its delicate spines bears some resemblance to P. hirsutus; but the hinge-line is proportionally shorter, the beak much more at- tenuate, the umbo narrower, more ventricose and much more incurved; while the surface is strongly striated longitudinally. Geological position and locality. Calcareous sandstone of the Chemung group : Steuben county, Productus rarispin^ (
. 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. 178 [Senate This shell in its delicate spines bears some resemblance to P. hirsutus; but the hinge-line is proportionally shorter, the beak much more at- tenuate, the umbo narrower, more ventricose and much more incurved; while the surface is strongly striated longitudinally. Geological position and locality. Calcareous sandstone of the Chemung group : Steuben county, Productus rarispin^ (n. s.). Pal. Shell semielliptical, length and height nearly equ^l; hinge-line about equalling the greatest width of the shell : ventral valve extremely gibbous or ventricose; lateral extremities abruptly deflected, and marked by two or three strong concentric folds which become obsolete upon the body of the shell; mesial ^ region broadly flattened or slightly depressed. Surface marked by fine concentric striae, and sometimes apparently by fine radiating stride, the cardino-lateral margins or ears having a few strong spines irregularly disposed : a few scattered spines also mark the mesial depression. This species differs from the last in the greater gibbosity of the ventral valve, the deflected cardinal extremities, the broad flattened or depressed mesial region and the scattered spines. It bears some resemblance to DE Koninck's figures of P. orbignianus, but it has fewer spines and no defined sinus. Geological position and locality. Shales of the Chemung group : Allegany county, Productus rarispin^.. 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
