The fauna of the Chazy limestone / by Percy E. Raymond.

  • Raymond, Percy Edward, 1879-1952.
Date:
[1905]
Catalogue details

Licence: In copyright

Credit: The fauna of the Chazy limestone / by Percy E. Raymond. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    Locality.—Rare at Cbazy, New York, in tlie Lower Cliazy layers sontli of the lime kilns. It occurs also at Lenoirs, Tennessee. Scenella rolmsta sp. nov. Shell large, a])ertnre nearly circular. Beak obtuse, rather high, and located a little behind the middle. All slopes about equal and all convex, the whole shell somewliat hemispheric. The specimens are all casts, showing no surface markings of any sort. The only perfect example is 17“ in greater diameter and 16“ in lessei’. A much larger one is represented by a frag- ment 27“* long, but it had evidently been considerably larger. Locality.—Yalcour Island, in the Middle Chazy beds. Rare. The type is in the writer’s collection. Palcmcmcea irregularis sp. nov. Shell rather large, irregular in outline, generally subcircular, but never with a smooth curve. Beak obtuse, almost central, sometimes a little back of the center. All slopes about equal, generally almost straight, but occasionally a little convex. Surface marked bv numerous tine concentric lines of growth, which follo's^^' the irregular form of the aperture. Usually there are a few radial folds and some irregular depressions and pits which do not follow in symmetrical arrangement. The greater diameter of the aperture is 26“; the lesser is lO'™. The aperture of another is long, 18'' wide, and the apex is 9“ above the aperture. Locality. —Common in lower layers at Chazy, New York. LLelicotoma vagrans sp. nov. Shell small, somewhat Maclurea-Wko.^ the spire Hat and depressed below the plane of the highest points on the upper surface. Outer edge of the body whorl angular, raised as a high sharp ridge toward the aperture. Lower surface of the shell rounded, the umbilicus wide. Aperture large, quadri- lateral, angular above, rounded below. Surface marked by fine lines of growth, which turn back on crossing the angle of the upper surface. Locality.— A rare fossil at Yalcour Island, New York. The type is in the writer’s collection. Eotomaria ohsoletum sp. nov. Shell small, trochiform, with about four volutions. The upper part is conical, the volutions are fiat, and the sutures only