A Review of the Land Mollusks of the Belgian Congo; Chiefly Based on the Collections of the American Museum Congo Expedition, 1909-1915

A Review of the Land Mollusks of the Belgian Congo; Chiefly Based on the Collections of the American Museum Congo Expedition, 1909-1915

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1919 edition. Excerpt: ...turrited, tapering from the last whorl, crystalline. First two whorls smooth; subsequent whorls having a. sculpture of strong, smooth, rounded ribs, not as wide as the intervals, which are smooth. On the penult whorl there are about 7 ribs in one millimeter. The upper ends of the ribs crenulate the suture. On the last whorl the ribs weaken at the periphery and are only weakly and in part indicated on the base. The whorls are moderately convex. The aperture is imperfectly trapezoidal. The outer lip is blunt, a little thickened and straightened or bent inward in the middle. The basal margin is rounded, well expanded. Columellar margin subvertical, nearly straight above, having a convex fold below, deeply excised at the base. The parietal callus is rather thick, and in fully adult shells it has a scarcely noticeable thickening near the termination of the outer lip. Length, 5.5 mm.; diameter, 1.8 mm.; length of aperture, 1.6 mm.; 7 whorls. The specimens occurred with Subulina angustior, Pseudopeas sarcatile, and Streptostele horei. Hitherto, this species has not been reported from any inland locality, so far as I have been able to learn. Ancey has supplemented Morelet's description with useful notes. The species was first referred to Streptostele by Nevill. It has not been The embryonic whorls are engraved with microscopic spiral lines; there is no axial sculpture. The outer margin of the peristome is strongly arched forward and has a blunt, smooth finish, but is not expanded. Type: Streptnstele teres, new species. lstrsploslclc (Eusbreplostele) lruncala Gc_rma.in, l915, _ Bull. Mus. Hist. Nat. Paris, p. 286. This number was received at The Acad. Nat. Sci. Philadelphia, February 16, 1917. 108. Streptostolo (Graptoltele) torus, new...show more

Product details

  • Paperback | 138 pages
  • 189 x 246 x 8mm | 259g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236900693
  • 9781236900692