Palaeontographical Society Monographs Volume 31, Nos. 137-142

Palaeontographical Society Monographs Volume 31, Nos. 137-142

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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. 1877 edition. Excerpt: ... wide, the palatal arch and the jaws elongated; the praeoperculum covers a portion of the cheek above the maxilla, which is large and broad posteriorly. The branchiostegal rays form a series of narrow fiat imbricating ganoid plates. The notochord is persistent; there are apparently no ribs; the vertebral arches, spinous processes, and interspinous bones are ossified; two sets of interspinous bones support at least the dorsal fin. The shoulder-girdle displays well-developed infra-clavicular plates. The rays of all the fins are numerous, closely set, and, save in the principal rays of the pectoral of some genera, closely jointed; those of the azygous fins overlap with their proximal extremities their supporting ossicles, than which they are also more numerous. The anterior margin of all the fins are in most, if'not in all, cases set with fulcral scales, which probably form a double series. The teeth are conical or cylindrical, very rarely plicate at the base, with large internal pulp cavity and with a distinct enamel cap on the apex. The following genera are included in this family, an being prefixed to the names of those which have as yet occurred in British Carboniferous rocks. 1. C/ie2'r0le, m's, Agassiz... Old Red Sandstone. 2. R/iabdolejpis, Troschel... Permian. 3. Cosmoptyc/i2'us, Traquair.. Carboniferous. 4. Palwoniscus, Blainville... Permian. 5. Elonic/it//_;/s, Giebel... Carboniferous. 6. Acrolepis, Agassiz Old Red Sandstone (?), Carboniferous, Permian. '7. Nematopiyc/zius, Traquair Carboniferous. 8. Cyclqaiyc/zius, Huxley. Carboniferous. 9. Cem'rolepz's, Egerton Lias. '10. Microconodus, Traquair Carboniferous. 11. Gonalodus, Traquair Carboniferous. 12. Amblypterus, Agassiz Permian.1 13. R/zaa'z'm'c/it//ya, ...show more

Product details

  • Paperback | 124 pages
  • 189 x 246 x 7mm | 236g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236936191
  • 9781236936196