Professional Paper - United States Geological SurveyThe Survey, 1902 - Geology |
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angle aperture appears basal base beds Belvidere Berry Black brown Bull Byram marl calcareous chambers character Cheyenne clay coarse collected common Conrad contains County Cretaceous curved Cushman D'Orbigny Dakota deposits described distinct entire feet figure flora formation fossils fragments Genus geologic gray H. B. Brady Heer Hill known later Leaf leaves Length Lesquereux less lime limestone locality lower margin material miles millimeter Miss Mountains numerous occur Orthaulax places Plate present probably range recorded referred region represented Rept River rocks rounded sand sandstone sandy scale Seaman shale shell side similar slightly smooth species specimens Spring Bayou station stone surface Survey sutures Tertiary Test thick thin tion U. S. Geol unit upper usually ventral Vicksburg Woodbine yellow Х Х Х
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Page 129 - No. 14 — (For further references to this species see Cushman, Bull. 71, US Nat. Mus., 1913, p. 55). Test elongate, slender, arcuate, chambers numerous, elliptical or ovate, elongate, tumid, sutures usually oblique, chambers increasing in length toward the apertural end, aperture radiate, slightly eccentric ; wall smooth. Length unknown but over 1 mm. ; diameter 0.2 mm. This species is common in the upper horizon at Danville and rare in the lower.
Page 129 - Test elongate, triangular in cross section, early portion tapering, adult portion with the sides nearly parallel and straight : chambers numerous, arranged triserially ; sutures not depressed, often slightly limbate; sides of the test flattened or very slightly concave; peripheral angles rounded; aperture slightly elongate at the base of the inner margin of the last-formed chamber ; wall finely punctate. Length 1 millimeter or less.
Page 90 - Paper 129, 1922, p. 90, pi. 14, fig. 4. Test elongate, fairly broad, thickest in the middle, thence thinning toward the periphery, in end view biconvex, central portion curved ; chambers rather low and broad, especially in the early stages, becoming higher in the adult and often less broad so that the later chambers in the adult make a test less wide than at...
Page 100 - ... through the layer of transparent shell material covering them; chambers about ten in the last-formed coil, the sutures oblique and curved backward but not depressed below the surface, slightly thickened and clear, joining at the periphery with the slight keel ; from below, the chambers of the last coil only visible; sutures ending at a point about one-third of the way in from the periphery, from which a secondary chamber is developed to the umbilical region, where the sutures come together in...
Page 28 - Shell broadly rounded-fusiform. Young shell with the spire a little shorter than the aperture, suture impressed, whorls numerous, nuclear whorls three, the subsequent ones showing faint traces of occasional thickenings disposed like the varices of Triton ; surface smooth ; anterior end of body whorl marked by a few faint revolving lines, no posterior canal. Adult shell more distinctly fusiform, the spire covered by a longitudinally striated incrustation covering the sutures and extending to the extreme...
Page 90 - Zoology, vol. 9, p. 363, pi. 43, figs. 1, 2, 1884. Test elongate, tapering, more or less oval or rounded in end view, chambers high, rotund, sutures deeply depressed; wall composed of coarse agglutinated sand grains ; aperture at the base of the inner margin of the chamber. Length, 1.50 millimeters or more.
Page 29 - ... considerable extent the outer lip ; spire freely enclosed in a pointed superstructure, or dome, built over it by an extension of the mantle; surface covered with longitudinal lines of growth, which extend continuously from the apex to the base. "Length (of imperfect specimens, lacking probably upward of an inch), 2.7 inches; width, 1.75 inches.
Page 27 - Unlike both of these genera the canal is not styliform but robust and comparatively short, and its terminal notch is formed by an almost rectangular truncation of the anterior portion of the outer lip. Like Rostellaria, it has a straight posterior canal, prolonged, however, further than is common in that genus.
Page 129 - Paper 129, 1922, p. 129, pl. (29), fig. 12. Test subglobular, broadly rounded at the apical end, bluntly pointed at the apertural end ; surface consisting of a reticulate pattern, the areoles of which are hexagonal, either arranged in vertical rows or irregular. Diameter 0.15 mm. This species was originally described from the Shetland Islands. The specimen here figured was checked carefully against topotype material and agrees in all essential particulars. The form figured occurs rarely in the upper...
Page 93 - Test composed of few chambers, seven to eight in the visible coil ; surface generally smooth, except on the sutures, which are marked by rather broad, curved, raised ridges, those near the earlier part of the coil broken into rounded knobs, especially near the umbilical area, the later ones more continuous ; periphery angled, the early portion carlnate; apertural face smooth and somewhat concave with acute projecting angles ; aperture radiate at the angle of the chamber.