File:The American journal of science (1909) (17529928964).jpg

Title: The American journal of science
Identifier: americanjourna4271909newh (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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Text Appearing Before Image:
G. JR. Wieland—On Marine Turtles. 121 dermal elements is lacking, although, an agreement with the five plastral keels of the leatherback may be conjectured. The Plastron (figure 8).—The nearly perfect plastron of the type has suffered somewhat during collection, by its removal from an exceedingly hard marl matrix into which the numer- ous and often interlocking spines of the mid-plastral region penetrated. Nevertheless, as finally mounted, the plastron may be said to be in splendid condition. All the central Fig. 11.
Text Appearing After Image:
Figure 11.—Archelon ischyros. Left eighth or ninth marginal as found in conjunction with an additional element in a supra-marginal position. Shown % natural size. If the anomalous element is not a supra-marginal it must be referred to the supra-neural series just anterior to the pygal. A .slight asymmetry does not prevent, although it makes such a position less probable. It is easier to consider this element as having been found in a natural position, and as perforce thus accounting for the supra-marginal keel of the carapace of Dermochelys. portions of the large plates are present, with most of the spines, so that neither their size, form, length, or number, is ever in doubt. More important still, all the elements are but little crushed and, save the epiplastra, are present in their normally articulated position, just as they were figured in 1898.9 In

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