. Bulletin - United States National Museum. Science. Fig. 105.—Homotrypella hospitalis ceassa. a, a Russian example, natural size; 6,tangential SECTION, X40, through THE LESS MATURE PORTION OF A ZOCECIAL LAYER; C, TANGENTIAL SECTION, X40, THROUGH THE MOST MATURE REGION OF THIS SPECIMEN, WHERE THE MESOPORES ARE OBSCURED BY A DENSE tissue; A, e, and/, three VERTICAL SECTIONS, X20, ILLUSTRATING THE CHARACTERS IN VARIOUS PARTS OF THE ZOARIUM. IN d THE YOUNGEST STAGE IS FIGURED WITH THE IMMATURE ZONE, AND THE EARLIEST PART OF THE MATURE REGION DISPLAYED. WASSALEM BEDS (D3), UXNORM, ESTHONLi. pores.
. Bulletin - United States National Museum. Science. Fig. 105.—Homotrypella hospitalis ceassa. a, a Russian example, natural size; 6,tangential SECTION, X40, through THE LESS MATURE PORTION OF A ZOCECIAL LAYER; C, TANGENTIAL SECTION, X40, THROUGH THE MOST MATURE REGION OF THIS SPECIMEN, WHERE THE MESOPORES ARE OBSCURED BY A DENSE tissue; A, e, and/, three VERTICAL SECTIONS, X20, ILLUSTRATING THE CHARACTERS IN VARIOUS PARTS OF THE ZOARIUM. IN d THE YOUNGEST STAGE IS FIGURED WITH THE IMMATURE ZONE, AND THE EARLIEST PART OF THE MATURE REGION DISPLAYED. WASSALEM BEDS (D3), UXNORM, ESTHONLi. pores. Although even these differences are subject to slight varia- tion, it is beheved that a varietal name for the older form is justified. Occurrence.—The typical form is abundant and characteristic in the Richmond formation at many American localities; the variety crassa is known from the Black River shales of Minnesota, Iowa, and elsewhere, and from the lower Trenton rocks, particularly at West Covington, Kentucky. The Russian specimen was found in the Wassalem beds (D3) at Uxnorm, near Reval, Esthonia. Plesiotij2)e.—Cat. No. 57279, Thin sections of the Russian type are in the collections of the British 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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