Geological Survey of Canada Sir W e Logan, F R S Director Volume 2; Figures and Descriptions of Canadian Organic Remains by Books Group Staff (2012, Trade Paperback)
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1865 Excerpt: ...but this feature may vary from accident, as in one specimen figured, which appears to have been broken in one of the stipes. This species is remarkable for the great development in the width of the stipes, which, in their extremely compressed condition, have the appearance of feathers imbedded in the shale. The specimens from which these figures have been drawn, present the fossil in a very unsatisfactory condition; and farther collections may show the necessity of separating some of the narrower forms under another specific designation. Explanations Of Figures or Graptolithus Pennatulus, Hall. Plate III. 1. A young specimen with the minute radicle, the stipes diverging almost horizon tally, or rectnngularly to the radicle. 2. A young specimen with one stipe entire, and a part of the other, less divergent than fig. 1. 3. A single imperfect stipe of a young or half-grown individual, which is narrower than usual. 4. A larger stipe, which is entire from the bas- to the apex. 5. A large or full-grown single stipe, which is nearly entire. 6. An enlargement to three diameters from fig. 4, showing the form and proportion of the cellules, and cell-denticles. 1. An enlargement to the same degree as the preceding, from fig. 5. 8. A young specimen where the stipes are twisted near the base, giving an appearance as if the serrations were on tho outer or lower side in relation to the direction of the radicle. Plate V. 9. A single stipe of thts species? The specimen is a largo stipe, somewhat obscurely preserved upon the surface of a slab of slate, with G. extensus, G. bryonoides, and l'hyllo%raptus ilici/olius. It is from the same locality with G. bijidus at Point Lvis. In the form of the stipe, and its gradual diminution towards the distal extremity, as well as in...
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General Books LLC
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1130622096
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9781130622096
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120658072
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Geological Survey of Canada Sir W e Logan, F R S Director Volume 2; Figures and Descriptions of Canadian Organic Remains