. Ontario Sessional Papers, 1874, . Tie. 44. is elevated, and the tube is consequently deeply umbi-licated on the free side. There is, however, nothing tolead one to suppose that the aperture did not open verynearly in the plane of the spiral. Surface, with finetransverse striae, and also vrith numerous strong spini- a, Spiror bis laxui (Hail), b. specimen of the n • .• ^ i i saiLe in which the last volution is free (after torm, projections Or ). From the Lower Helderberg forma-tion, c, ^piVoriis spi/iu/i/era (Xich.) Hamil-ton formation, omphalodes (Goldfuss) ; but it is
. Ontario Sessional Papers, 1874, . Tie. 44. is elevated, and the tube is consequently deeply umbi-licated on the free side. There is, however, nothing tolead one to suppose that the aperture did not open verynearly in the plane of the spiral. Surface, with finetransverse striae, and also vrith numerous strong spini- a, Spiror bis laxui (Hail), b. specimen of the n • .• ^ i i saiLe in which the last volution is free (after torm, projections Or ). From the Lower Helderberg forma-tion, c, ^piVoriis spi/iu/i/era (Xich.) Hamil-ton formation, omphalodes (Goldfuss) ; but it is slightly larger, and its surface characters are quite different. From S. angulatus (Hall), it is separated by its regularly rounded, not angulated or compressed tube, its larger dimensions, and its spinulose- surface. Locality and Formation. Hamilton group : Arkona. Growing upon Heliophyllum Halli. In form and dimensions this species is near S. 84 38 Victoria. Sessional Papers (No. 8.) A. 1874. APPENDIX. HOLOPEA ? OCCIDENTALIS (Nicholson). Shell conical, with a small but elevated spire; whorls five, convex, with the greatest con-vexity in the upper fowth ; body-whorl extremely large, occupying nearly three-fourths of thelength of the shell, moderately expanded towards the aperture, at which point it is almostfree. Aperture circular. In the cast there is a large umbilicus. The length of the shell is twenty-one lines, the width of thebase (including the aperture) is nineteen lines; the height ofthe body-whorl is fifteen lines, the height and width of theaperture, each nearly nine lines, the width of the umbilicusis four lines, and the height of the spire is about six lines. Thesurface characters are unknown. It is impossible to feel certain whether this form is rightlyreferable to Holopea or not, though its general characterswould lead us to place it in this genus. The species i^ distin-guished by its short but elevated spire, its large Oo^^ becoming almost di
Size: 1485px × 1682px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorontariol, bookcentury1800, bookdecade1870, bookyear1874
