Bulletin of the American Museum of Natural History Volume 40

Bulletin of the American Museum of Natural History Volume 40

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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: ...summit. The surface appears opaque, smooth and glossy; but under the microscope, fine but clearly engraved spirals may be seen. Relative to their width they are rather widely spaced, from.05 to.035 mm. apart on the face of the last whorl. They become obsolete in the peripheral region, and are lacking on the base. They begin on the first whorl The color is ecru-olive,1 showing a few narrow darker lines of growth arrest on the last two whorls. The whorls are weakly convex, the suture even and moderately impressed. The embryonic 1% whorls form a hemispherical summit, a darker line marking its limit. The aperture is piriform. Columella slightly twisted and very weakly, obliquely subtruncate at its base. The outer lip has a smooth, blunt, rounded edge; in profile view it is seen to project forward in a rounded lobe, prominent in the median third of its length, retracting above and below. Length, 4.5 mm.; diameter, 1.6 mm.; diameter at second whorl,0.9 mm.; length of aperture, 1.3 mm.; 7 whorls. I do not know of any shell closely resembling this species. Three specimens were obtained, but two of them are more or less broken. Other Species of Streptostele Recorded from the Belgian Congo Strcptostele alluaudi (Dautzenberg and Germain) Streptostele alluaudi DAUTZENBERG AND GERMAIN, 1914, Rev. Zool. Afric., IV, p. 12, P1. 11, figs. 1 and 2. Type locality: Kisantu (Bequaert Coll.). Strepiostele costulata v. Martens Streptostele costulata E. v. MARTENS, 1892, Sitz. Ber. Ges. naturf. Fr. Berlin, p. 178; 1897, Deutsch Ost Afr., IV, Beschalte Weichth., p. 340. J. THIELE, 1911, Wiss. Ergebn. D. Z. Afr. Exp. (1907-O8), III, p. 176, P1. IV, fig. 3. Type locality: Butumbi (Stuhlmann Coll.). (1907-08), III, p. 177. Type locality: Bukende in the Semliki...show more

Product details

  • Paperback
  • 189 x 246 x 8mm | 263g
  • Rarebooksclub.com
  • English
  • Illustrations, black and white
  • 1236850440
  • 9781236850447