File:The American journal of science (1897) (17966080370).jpg

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Description
English:

Title: The American journal of science
Identifier: americanjournal441897newh (find matches)
Year: 1880 (1880s)
Authors:
Subjects: Science
Publisher: New Haven : J. D. & E. S. Dana
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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About This Book: Catalog Entry
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Text Appearing Before Image:
Ctenacanthus Spines from the Keokuk Limestone. 11 this form, both in size, shape, and details of ornamentation. The longitudinal costse are of round cross-section, about the same dis- tance apart, and are denticulated or collared in the same manner in both forms. In G. xiphias, how- ever, they arise less frequently by dichotomy, and as far as can be learned from the present speci- men, the series of denticles on the posterior face is nearly obsolete. Only the bases of these denticles are preserved on the specimen, but they are quite faint, and appear to be limited to the distal half of the spine. The exserted portion is very obliquely demar- cated from the base, and the pulp- cavity remains open for quite a distance beyond it. No evidence of a keel appears on either face, but along the anterior margin two longitudinal costse, arising one on either side, unite to form a blunt ridge serving as a cutwater. The inserted portion tapers more grad- ually than in C. denticulatas and most other species. A knowledge of these characters enables us to frame a more complete diagnosis of this species, as follows : Ctenacanthus xiphias (St. John and Worthen). Spines attaining a length of over 20cm, moderately curved, the ante- rior margin more strongly convex than the posterior ; gradually taper- ing, and laterally very much com- pressed. Base deeply embedded, tapering, and obliquely marked off from the exserted portion; pulp timesenlarged. cavity continued in a posterior channel for about half the total length of the spine. Denticles oi' posterior angles uniformly spaced, more or less rudimentary. Ornamentation consisting of parallel longitudinal ridges, rarely bifurcating or implanted, rounded, about their own diameter
Text Appearing After Image:
J.W.F. Fig. 1.— Ctenacanthus xip7iias(St. John and Worthen). A, Spine f natural size. B, Ornamentation 4

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Source https://www.flickr.com/photos/internetarchivebookimages/17966080370/
Author Internet Archive Book Images
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(Reusing this file)		 At the time of upload, the image license was automatically confirmed using the Flickr API. For more information see Flickr API detail.
Volume
InfoField
ser. 4 v. 4 1897
Flickr tags
InfoField
  • bookid:americanjournal441897newh
  • bookyear:1880
  • bookdecade:1880
  • bookcentury:1800
  • booksubject:Science
  • bookpublisher:New_Haven_J_D_E_S_Dana
  • bookcontributor:Smithsonian_Libraries
  • booksponsor:Biodiversity_Heritage_Library
  • bookleafnumber:27
  • bookcollection:biodiversity
  • BHL Collection
  • BHL Consortium
Flickr posted date
InfoField
27 May 2015

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