. Bulletin - United States National Museum. Science. 208 BUUi-ETIN" "11, UNITED STATES NATIONAL MUSEUM. As understood at tlie present time, this genus has abundant repre- sentatives in the southern Atlantic faunas of Upper Ordovician time, but, with a single exception, no species are known in other Ordovician formations. The exception is the Leptotrypa hexagonalis Ulrich, known in America only in the Platteville limestone of Wisconsin and Minnesota, but represented in the Kuckers shale (C2) of Esthonia by numerous specimens. LEPTOTRYPA HEXAGONALIS TJlricli. Text figs. 112-114. Leptot
. Bulletin - United States National Museum. Science. 208 BUUi-ETIN" "11, UNITED STATES NATIONAL MUSEUM. As understood at tlie present time, this genus has abundant repre- sentatives in the southern Atlantic faunas of Upper Ordovician time, but, with a single exception, no species are known in other Ordovician formations. The exception is the Leptotrypa hexagonalis Ulrich, known in America only in the Platteville limestone of Wisconsin and Minnesota, but represented in the Kuckers shale (C2) of Esthonia by numerous specimens. LEPTOTRYPA HEXAGONALIS TJlricli. Text figs. 112-114. Leptotrypa Tiexagonalis Ulrich, Geol. Surv. lUinois, vol. 8, 1890, p. 455, pi. 36, figs. 6, 6 a; Geol. and Nat. Hist. Surv. Minnesota, vol. 3,pt. 1, 1893, p. 317. Original description.—Zoarinm forming parasitic expansions less than 1 mm. in thickness, spread upon Orthoceras and Eyolithes. Surface emooth. Clusters of cell. 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 United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off.
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