Palaeontographical Society Monographs Volume 3, Nos. 4-7

Palaeontographical Society Monographs Volume 3, Nos. 4-7

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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. 1849 edition. Excerpt: ...evidently engendered a doubt in the mind of Professor Agassiz as to the validity of the zoologicial position he assigned to it. The principal structural peculiarities he so clearly points out have, he says,1 a greater afiinity to Pycnozlus and G/rorlus than to Palwoniscus and Calurus. On the receipt of the Ferry Hill specimen, feeling unwilling to trust my own imperfect judgment on a point of so much importance, I informed Agassiz of the reasons which induced me to propose the alteration, and the following passage from his answer fully authorises the change: -----"I quite agree with you in the propriety of combining the genus Plafysomu-5 with the Pycnodonts; for some time past I had indeed been impressed with the great. difference there is between that genus and the others of the family in which it stands, and I now feel that my only reason for putting it there was the heterocercal form of tail, a character which could not fail to produce a vivid impression upon my mind when first discovered, but which I now expect to find in fishes of various families in the oldest geological ages, as well as everywhere in the youngest state of our actual fishes in their embryonic growth. The teeth, as you mention, are conclusive evidence for placing Plalysomus with the Pycnodonts. Let me now point out to you another evidence of this relation in the form of the skeleton, especially of the apophyses before the dorsal. The specimens of Plaiysomus in the Museum in Munich show some good portions of the skeleton, and in my mind I can now compare them to the skeleton of the small P/cnorlus r/mmbus, without detecting any difi"erence. Pray institute the comparison upon a safer ground than recollection, and let me know what you find. You know more

Product details

  • Paperback | 226 pages
  • 189 x 246 x 12mm | 413g
  • United States
  • English
  • black & white illustrations
  • 1236791770
  • 9781236791771