Memoirs of the Geological Survey of India; Palaeontologia Indica. Being Figures and Descriptions of the Organic Remains Procured During the Progress of the Geological Survey of India. Series II. III. V. VI. VIII. (A.) Cretaceous Volume 3

Memoirs of the Geological Survey of India; Palaeontologia Indica. Being Figures and Descriptions of the Organic Remains Procured During the Progress of the Geological Survey of India. Series II. III. V. VI. VIII. (A.) Cretaceous 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. 1870 edition. Excerpt: ...is most commonly smooth with fine concentric striae of growth. Types, R. angulosa, d'Orb., or R. llortoni, ll/Iant. In the first the internal ridges of the attached valve do not seem to be present, in the latter they are well developed, but do not reach to the margin. Bayle and others have referred this last species to Sp/L(e)'ulites, but this is, I believe, a mistake. I also think that several other species, as Bad. Pailetteana and Martiniana of d'O1-bigny, rather belong to this genus than to Sphrerulites, to which they had been referred by Bayle. 2. Sphrcrulzhs, de la lIerth., 1805, (Bayle, ibid., p. 800). Attached valve generally elongately conical with longitudinal more or less foliated surface and the margins radiately ribbed, internally with a single umbonal rib extending the whole length of the valve. Free valve smaller, similar in form and structure to that of Radiolites, but with a median tooth or columella corresponding to the hingerib of the other valve, in which there is on eacl1 side of the rib a cartilage-process, the two cartilage-plates being sometimes united in front, and next to them are situated the raised muscular scars. Type, Spkaerulites angeiodes, Picot de la Peir. The presence of a. hinge-rib readily distinguishes the present genus from the former, and the absence of any other ribs or folds in the attached valve separate it from Hippurites. In several tolerably well preserved specimens of the lower valve I have not been able to trace the extent of the muscular impressions, but from some valves figured by d'Orbigny they seem to be very large. In the upper valves I have seen no special hinge-teeth or lamellae, but whether they do not exist in some species, as has been recorded, I am unable to say....
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Product details

  • Paperback | 270 pages
  • 189 x 246 x 14mm | 485g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236861302
  • 9781236861306