. Bulletin of the Buffalo Society of Natural Sciences. Natural history -- New York (State); Natural history. and obscure longitudinal Fig. 198. Platyceras symmet- ricum. A characteristic specimen — the lower part is too strongly differentiated from the upper i from Hall). Platyceras SYMMETRIC !1 m Vol. V., Pt, II., p. 9, PI. III.) D is t in g u is h i n g Characters.— Strongly arcuate and incurved form, with one or one and one-half volutions coiled in the same plane, last volution free; equally spread- ing lower portion; oblique, sub- quadrate to rhomboidal aperture; sinuate peristome; concent
. Bulletin of the Buffalo Society of Natural Sciences. Natural history -- New York (State); Natural history. and obscure longitudinal Fig. 198. Platyceras symmet- ricum. A characteristic specimen — the lower part is too strongly differentiated from the upper i from Hall). Platyceras SYMMETRIC !1 m Vol. V., Pt, II., p. 9, PI. III.) D is t in g u is h i n g Characters.— Strongly arcuate and incurved form, with one or one and one-half volutions coiled in the same plane, last volution free; equally spread- ing lower portion; oblique, sub- quadrate to rhomboidal aperture; sinuate peristome; concentric striae; ridges. Found in the middle Pleurodictyum bed, in Avery's Creek (rare). Platyceras (Orthonychia) attenuatum. Hall. 199.) (Pal. N. Y., Vol. V., Pt. II., p. 6, PI. III.) Distinguishing Characters. — Conical form ; minute and slightly inrolled apex, making from one to one and one-half volu- tions; abrupt expansion of body-whorl; very oblique peristome; crowded, undulat- FlG 199 piatycenu ing concentric striae; irregular, undefined SaiiT'" "''"'' longitudinal folds; sinuous peristome. Found in the Encrinal limestone, and the Stictopora and Demissa beds, at Section 5; in the Trilobite beds, at Section 8 (rare). ( 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 Buffalo Society of Natural Sciences. Buffalo, N. Y. : The Society
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