Palaeontographical Society Monographs Volume 49, Nos. 230-233

Palaeontographical Society Monographs Volume 49, Nos. 230-233

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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. 1895 edition. Excerpt: a greater extent than the presence or absence of genera of Ostracods, whether marine or not. Anthracoxia, Kinahan, 1878. Myacites, Kinahan, 187 8. Antlzracosia, Baily, 1881. 1 This papal, was read on February 5th, 1834, and April 15th and 27th, 1836. though the publication bears the date 1840. llfgacites, Baily, 1881. Non Anthrucomya, Hull, 1881. Anthracosia, Achepol, 1880-83. Anodon, Achepol, 1880-83. Naiaditis, Barrois, 1882. Antlzracomya, Ward, 1890.----Hind, 1893. Generic 0ha.1'a.cte1's.-Shell transverse, slightly inequivalve, very inequilateral, the anterior end being small and rounded, while the posterior is pr0Cll10d, compressed, expanded, and generally truncate. The umbones are small and low, situated near the anterior end, very slightly raised above the hinge-line, which IS straight, long, and with a cardinal and one long posterior lateral tooth in at least one species. It has a narrow interior ridge, parallel with the edge, in its p0StI'I01" portion, which leaves a groove in casts. There is present ablunt oblique swelling, which arises at the umbones, and expanding as it passes downwards and backwards, becomes lost on the posterior portion of the shell. Parallel and ant1'i0I' to the ridge there is an oblique shallow sulcus, which becomes expanded as it approaches the inferior margin. The ligament is small, erect, and external. Interior.-Nacreous, smooth; pallial line simple. Anterior adductor scar deep, almost marginal, that of the accessory adductor situated above and p0stcF10I' to it. The posterior adductor scar is shallow and somewhat elongate, generally situated on the posterior slope not far from the hinge. Surface.-The exterior is ornamented with fine...
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Product details

  • Paperback | 110 pages
  • 189 x 246 x 6mm | 213g
  • United States
  • English
  • black & white illustrations
  • 1236947657
  • 9781236947659