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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116 G. M. Wieland—On Marine Turtles. which are evidently small posteriorly. Immediately back of. the nuchal, however, there does not appear to be an underly- ing neural, and one may say with certainty that all the anterior neurals at least are very greatly reduced. It is, too, equally clear that these mere thin sheets of underlying bones that can be referred to neurals, so far as they were seen in fracture sections, have had their function taken over by the Fig. 8.
Text Appearing After Image:
Figure 8.—Archelon ischyros, x 1/36. Ventral view of type. Compare legend of the preceding figure. Note that all the elements of the plastron here shown occupied their normal position as originally recovered. Only the doubtful position of the omitted epiplastra prevents final accuracy. Note also the great length, of the plastron ; it is nearly as long as the cara- pace. Observe the small size of the femoral notches. The rib pair passing beneath the hyo-hypoplastral suture is the fifth. outer dermal series, which is continuous from nuchal to pygal and thus corresponds to the neural keel of Dermochelys. On the nuchal itself no additional elements were observed, but, as just stated, one may suppose from the great reduction in thickness such may well have been present. Indeed, it is not impossible that the posterior end of the nuchal extended beneath the first of the median supra-neural elements, and

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