. Bulletin - United States National Museum. Science. Fig. 103.—Homotetpella cribrosa. a, vertical section, X20, illustrating the short mature zone AND tabulation; 6, tangentU-L section, X20, showing characters of the early part of the mature zone in the upper half and the later part in the lower half; c, several zocecla of the same section, X35. Wassalem beds (D3), Uxnorm, Esthonla. in the Black River (Decorah) shales at Fountain and other locaHties in Minnesota. Holotype.—Cat. No. 57278, Specimens and thin sections from the Wassalem beds, Uxnorm, are in the collections of the British
. Bulletin - United States National Museum. Science. Fig. 103.—Homotetpella cribrosa. a, vertical section, X20, illustrating the short mature zone AND tabulation; 6, tangentU-L section, X20, showing characters of the early part of the mature zone in the upper half and the later part in the lower half; c, several zocecla of the same section, X35. Wassalem beds (D3), Uxnorm, Esthonla. in the Black River (Decorah) shales at Fountain and other locaHties in Minnesota. Holotype.—Cat. No. 57278, Specimens and thin sections from the Wassalem beds, Uxnorm, are in the collections of the British Museum. HOMOTRYPELLA HOSPITALIS CRASSA (Ulrich). Text figs. 104, 105. Atadoporella crassa Ulrich, Geol. and Nat. Hist. Surv. Minnesota, vol. 3, pt. 1, 1893, p. 225, pi. 15, figs. 18-21. Cfr. Monticulipora (Prasopora) selwynii var. hospitalis Nicholson, Genus Monti- culipora, 1881, p. 209, fig. 45. One of the most abundant and characteristic fossils of the Rich- mond formation in North America is the bryozoan described by Nicholson as Monticulipora {Prasopora) selwynii var. Tiospitalis, later referred by Ulrich as a valid species of Prasopora. The small, more or less rounded zoarium, with zocecia having numerous acan- thopores, lined with cystiphragms and separated by closely tabu- lated mesopores, make this form especially easy of recognition. Detailed collecting in the American Black River and Trenton hori- zons resulted in the discovery of a species or variety closely related to the Richmond form, and now the study of the Russian Ordovician. 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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