Palaeontographical Society Monographs Volume 21, Nos. 89-93

Palaeontographical Society Monographs Volume 21, Nos. 89-93

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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. 1868 edition. Excerpt: ...first; but he was led to conclude that they were allied forms partly by real, partly by fancied resemblances in construction, and by their occurring under the same conditions. He remarked, however, very strongly on the differences between the first and the last of his species of Oep/ralaspis, and pointed out that, in addition to the differences in contour and shape, there were differences in minute structure and ornamentation, which would probably lead at some future time to a separation of the species into other genera. In 1847 Dr. Rudolph Kner published a memoir in Haidinger's ' Naturwissenschaftliche Abhandlungen, ' for the purpose of proving that Cephalawis Lewisii and 0. Llogdii were not the remains of Fish at all, but that they were the internal shells of a Cephalopod allied to Sepia, for which he proposed the generic title Pteraapis.. Dr. Kner's conclusions were based upon the examination of a fossil' (evidently closely allied to C. Llogdii) from the Upper Silurian (perhaps corresponding to our lowest Devonian) strata of Gallicia. The structure of the test in this fossil was observed by Dr. Kner to differ from that of any known osseous remains of Fishes; and he considered, from a somewhat superficial examination of both structures, that it agreed closely with the cuttle-bone of Sepia. (See also p. 12.) In 1856 Dr. Ferdinand Roemer, in Dunker and Von Meyer's 'Palzeontographica, ' described a fossil from the Devonian strata of the Laacher See as Palazoteut/uls, referring it to the Sepiadze. Professor Huxley has since shown this to be closely related to Agassiz's Cqn/zalayis Lloydfi. Roemer, in referring to Kner's memoir, expressed the opinion that his Pterayides were the...show more

Product details

  • Paperback | 114 pages
  • 189 x 246 x 6mm | 218g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 123678863X
  • 9781236788634