Pecten rigida Hall & Meek, 1856
HALL, J. & F. B. MEEK. 1856. Descriptions of New Species of Fossils, from the Cretaceous Formations of Nebraska with Observations upon Baculites ovatus and B. compressus, and the Progressive Development of the Septa in Baculites, Ammonites, and Scaphites. Memoirs of the American Academy of Arts and Sciences [New Series], 5 (2): 379-411, pls. 1-8. [p. 381, pl. 1, figs. 4a-4c]
«Pecten rigida, n. sp.
Plate II [erratum: plate I]. Fig. 4, a, b, c.
Shell obovate, height greater than length, very gradually narrowing towards the hinge; valves equally convex; hinge line short; wings minute, nearly equal, anterior one truncate, posterior one pointed, striated upon the surface; left or inferior valve marked by strong, concentric undulations; superior valve smooth, or marked in the exfoliated shell by faint radiating stria;. Length, .19 inch ; height, .23 inch.
The strong concentric undulations of the inferior valve are likewise conspicuous on the cast, and are there crossed by radiating striae. The superior valve, which has the shell partially exfoliated, shows only faint radiating striae without concentric undulations as in the other valve. Perfect specimens may perhaps show other markings on the superior valve not visible in these. Locality and Position. — Sage Creek, Nebraska. Upper part of division No. 4 of Cretaceous Strata.»
JAMES HALL & FIELDING BRADFORD MEEK, 1856
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J. Hall & F. B. Meel, 1856, plate 1.
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