The Paleontology and Stratigraphy of the Marine Pliocene and Pleistocene of San Pedro, California Volume 3

The Paleontology and Stratigraphy of the Marine Pliocene and Pleistocene of San Pedro, California Volume 3

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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. 1903 edition. Excerpt: ...which are convexly angulated posteriorly just posterior to angle of whorl; suture deeply impressed, distinct; aperture elongate-elliptical; outer lip thin, arcuate anteriorly; inner lip incrusted; columella slightly recurved, with one prominent plication in middle of aperture; posterior sinus prominent; anterior sinus rather short. Dz'men.r1'ans.----Long. 23.5 mm.; lat. 9 mm.; body-whorl 13 mm.; aperture, including canal, 10 mm.; defl. 27 degrees. Distinguishable by mammilliform apex, small deflection, sharply angulated, smooth whorls, and plication on columella. Specimens pronounced new species by Dr. Dall. Bare in lower San Pedro series and Pliocene at Deadman Island. The specimen figured is the type, which is from the lower San Pedro series at Deadman Isla11d, and is now in the United States National Museum. Shell small, fusiform; apex mammilliform; whorls five or six, angulated slightly anterior to middle; body-whorl less angulated than those of spire; surface smooth, except for incremental lines, which are oblique, and angulated convexly posteriorly a little above angle of whorl; suture deeply impressed, distinct; aperture elliptical; outer lip thin, arcuate anteriorly below posterior sinus; inner lip incrusted; columella incrusted, straight, with one prominent plication in middle of aperture; posterior sinus shallow; anterior sinus short. Dimensians.----Lo11g. 13 m1n.; lat. 6.5 1nm.; body-whorl 8.2 mn1.; aperture, including canal, 6.5 mm.; defl. 50 degrees. Distinguishable from B. dallii by greatly depressed spire, fewer whorls a11d lack of nodes on apical whorls. Pronounced a new species by Dr. Dall. Rare in lower San Pedro series; two found at Deadman Island. The specimen figured is the type, which is from the lower San Pedro...show more

Product details

  • Paperback | 158 pages
  • 189 x 246 x 9mm | 295g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236891228
  • 9781236891228