. Bulletin - United States National Museum. Science. EARLY PALEOZOIC BEYOZOA OP THE BALTIC PROVINCES. 275 In the above description Ulrich has embodied all of the essential features of the species. The Eussian examples referred here are so similar externally and internally that there can be little doubt of the correctness of their reference to Batostoma >-. / Fig. 163.—Batostoma fertile, a and 6, a large and a small specimen, natural size; c, surface OF THE LARGER SPECIMEN, X9; d, TANGENTIAL SECTION OF THE SAME EXAMPLE, X18; €, VERTICAL SEC- TION, NATURAL SIZE, AND A PORTION, X18.
. Bulletin - United States National Museum. Science. EARLY PALEOZOIC BEYOZOA OP THE BALTIC PROVINCES. 275 In the above description Ulrich has embodied all of the essential features of the species. The Eussian examples referred here are so similar externally and internally that there can be little doubt of the correctness of their reference to Batostoma >-. / Fig. 163.—Batostoma fertile, a and 6, a large and a small specimen, natural size; c, surface OF THE LARGER SPECIMEN, X9; d, TANGENTIAL SECTION OF THE SAME EXAMPLE, X18; €, VERTICAL SEC- TION, NATURAL SIZE, AND A PORTION, X18. BLACK RiVER (DECORAH) SHALES, MINNEAPOLIS, MINNE- SOTA. (After Ulrich.) Occurrence.—Common in the Stictoporella bed of the Black River (Decorah) shales of Minnesota; rare in the Echinospherites lime- stone (CI) near Reval, Esthonia (Cat. No. 57378, ). American specimens of the species are in the collections of the British Museum. BATOSTOMA FERTILE CIRCULARE Ulrich. Text fig. 164. Batostoma fertile var. circulare Ulrich, Geol. and Nat. Hist. Surv. Minnesota, vol. 3, pt. 1, 1893, p. 291, pi. 25, figs. 8, 9; Zittel's Textbook of Paleontology (Eng. ed.), 1896, p. 275, fig. 459 B. The distinctive feature of this variety is pointed out in the above description, and illustrated in the accompanying figure, although often the peristomes are thicker and more distinctly separated from each other than is shown in the figure. Both species and variety are found associated in American strata and likewise in the 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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