. Bulletin - United States National Museum. Science. Fig. 168.—Batostoma wtnchelli sPrNTJiosuM. a and 6, tangential section, x18, and a single zoce- CIXJM, X50, "\yiTH NUMEROUS ACANTHOPOBES. BLACK RiVER (DECOEAH) SHALES, ST. PAUL, MINNE- SOTA. (After Ulrich.) BATOSTOMA GRANULOSTTM, new species. Text fig. 169. Only two examples of this form are known to me, but its large zooBcia and numerous large acanthopores, in addition to its internal structure, form a combination of characters so different from other species of Batostoma that I do not hesitate to describe it as new. The example on whi
. Bulletin - United States National Museum. Science. Fig. 168.—Batostoma wtnchelli sPrNTJiosuM. a and 6, tangential section, x18, and a single zoce- CIXJM, X50, "\yiTH NUMEROUS ACANTHOPOBES. BLACK RiVER (DECOEAH) SHALES, ST. PAUL, MINNE- SOTA. (After Ulrich.) BATOSTOMA GRANULOSTTM, new species. Text fig. 169. Only two examples of this form are known to me, but its large zooBcia and numerous large acanthopores, in addition to its internal structure, form a combination of characters so different from other species of Batostoma that I do not hesitate to describe it as new. The example on which the description is based is a cyhndrical stem 8 mm. in diameter, most of which has been used in making the thin sections studied. Its surface is free from monticules but granulose because of the numerous acanthopores. Zocscia thick-walled, irregularly polygonal with occasional mesopores. Acanthopores large and numerous, eight usually surrounding a zooecium. Three and one-half to four zooecia in 2 mm. Macule of larger zooecia and more abundant mesopores a conspicuous feature of the surface and of thin sections. The internal structure is that of a typical Batostoma. In the vertical section figured the mature region is short and little devel- oped, but the beaded mesopores and usual wall structure of the genus are apparent. Tangential sections bring out the numerous large acanthopores very plainly and show in addition rather few 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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