. 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. s. This species is smaller than the preceding, with fewer radiating plications. Itdiffers from M. multicosta in the absence of a mesial fold, and smaller number ofribs. Geological formation and locality. Upper black shales of the Hamilton group:Bigstream point, Seneca county; and other places in Western New-York. MERISTELLA MESACOSTALIS. Atrypa mesacostalis : Hall, Report on 4th Geol. Dist. New-York. Il
. 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. s. This species is smaller than the preceding, with fewer radiating plications. Itdiffers from M. multicosta in the absence of a mesial fold, and smaller number ofribs. Geological formation and locality. Upper black shales of the Hamilton group:Bigstream point, Seneca county; and other places in Western New-York. MERISTELLA MESACOSTALIS. Atrypa mesacostalis : Hall, Report on 4th Geol. Dist. New-York. Illustrations of Fossils ofthe Chemung group, G4, ff. 1, 1 o, 1 b. Shell somewhat elongated, with moderately prominent beak. Valves convex, withwell-defined mesial lobe and sinus, which are covered with plications; thosebordering the sinus are the largest. Lateral portions of the shell smooth, or withobscure species is usually larger than any of the preceding, and is characterized by its elongate form and plain or obscurely marked lateral portions of the formation and locality. In rocks of the Chemung group : Steuben county, and other parts of Western New-Y^ lOf
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectscience, bookyear1853
