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Download pdf Maryland Geological Survey Volume 2

Download pdf Maryland Geological Survey Volume 2

Maryland Geological Survey Volume 2 by Maryland Geological Survey

Maryland Geological Survey Volume 2
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Author: Maryland Geological Survey
Number of Pages: 216 pages
Published Date: 01 Mar 2012
Publisher: Rarebooksclub.com
Publication Country: Miami Fl, United States
Language: English
ISBN: 9781130288759
Download Link: Maryland Geological Survey Volume 2
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1904 Excerpt: ...Bapana quadricostata Tryon, 1882, Manual of Conchology, vol. iv, p. 202, pi. lxll. fig. 341. Ecphora 7uadricofaata Dall, 1890, Trans. Wagner Free Inst. Sci., vol. iii, pt. i, p. 125. Ecphora quadricostata Harris, 18!)3, Amer. Jour. Sci., ser. iii, vol. xlv, p. 28. (Not pp. 24, 27.) Hapana (Ecphora) quadricosta Cossmann, 1903, Essais de PaKJoconeh. Comp., vol. v, p. 64, pi. iii, tig. 14. Description.--" Ovate-ventricose; with a dilated umbilicus, and four much elevated belts. which are more dilated at their tops. "Spire short, the volutions with but two belts. the others being concealed by the succeeding whorls: body whorl with four belts, which are equidistant, much elevated, wider at top than at the junction with the whorl, and with one or two deeply impressed lines; intervening spaces wrinkled, the wrinkles extending over the belts: aperture suboval: caned short and contracted: lab rum with a groove corresponding with each of the exterior ribs: umbilicus dilated, large, not visibly penetrating to the inner summit; the exterior margin prominent and deeply dentated." Say, 1824. The essential characters of this species as here restricted are: four revolving costie, which in the adult are of equal prominence and T-shaped in cross section. The adult is more depressed than the young, and with this depression comes the flattening of the costae, the flaring of the umbilicus, and a looser coiling of the whorls. This species is apparently the only one at Cove Point and St. Mary's River and in the states south of Maryland. It has not been found at other Maryland localities than those mentioned above. Tuomey and Holmes' figure is so imperfect that it is impossible to state whether it represents the typical form of the species or the following variety. ...

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