Palaeontology of New York Volume 1

Palaeontology of New York Volume 1

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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. 1847 edition. Excerpt: ... which they are in some respects allied. Fig. 2 a. Lateral view of a specimen, having the sinuous lamellae at the ordinary distance asunder. Fig. 2 b. Dorsal view of the same. Fig. 2 c. Lateral view of a specimen, where the elevated lamellae are more distant. Fig. 2 d. Lateral view of another, showing the lamellae closely arranged. Fig. 2 e. A cast, which is smooth, with the exception of the elevated carina. Fig. 2/ A portion of the surface enlarged, showing the finer transverse nnd longitudinal striae, and the subnodulose appearance of the surface. Position and locality. This species occurs, in its greatest perfection, in the lower shaly strata of the Trenton limestone at Middleville. It is found, also, in the higher crystalline pirt of the rock at the same place; and, in the form of casts, in the higher crystalline portions of the same rock at Watertown. 247. 2. CYRTOLITES TRENTONENSIS. pl. XL. A. Figs. 3 a, b, c, d; and Pl. XLI. Figs. 1 a, b, c. Cyrtolites trentememis. Conrad, Jour. Acad. Nat. Science, 1842, Vol. viii, pag. 270, pl. 17, fig. 4. Compare Ecculiomphalus minor, Portlock, Geol. Rep. Londonderry, 1843, pag. 412, pl. 30, figs. 11 & 12. Shell slender, angular, gradually curving and tapering to an acute point, making rather less than an entire volution; dorsal and ventral margins angulated or subcarinated; lower side distinctly angulated; upper side less prominently angulated, and suddenly contracted on the inner margin; section subquadrangular; aperture scarcely expanded; surface marked by obliquely transverse striae. This peculiar little shell has the appearance of a claw or talon, making from two thirds to nearly an entire volution. It bears considerable resemblance to Ecculiomphalus minor, cited above. It differs in some...
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Product details

  • Paperback | 176 pages
  • 189 x 246 x 10mm | 327g
  • Miami Fl, United States
  • English
  • Illustrations, black and white
  • 1236570707
  • 9781236570703