Ancestry of the Tetrapods

@article{Westoll1938AncestryOT,
  title={Ancestry of the Tetrapods},
  author={Thomas Stanley Westoll},
  journal={Nature},
  year={1938},
  volume={141},
  pages={127-128}
}
DURING the last few decades it has become increasingly clear that theTetrapods were derived from a group of fishes having their closest affinities with the Devonian Crossopterygii and Dipnoi. In 1932, Save-Soderbergh published a valuable description1 of some fossils, from the “Upper Devonian” of East Greenland, which afford a valuable bridge between the Crossopterygii and the Carboniferous Stegocephalians. These forms, the Ichthyostegalia, are much closer to the Stegocephalians than to the… 
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IV.—The Origin of Continental Vertebrate Faunas
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The discovery of a well-preserved species of fossil sarcopterygian fish from the Late Devonian of Arctic Canada that represents an intermediate between fish with fins and tetrapods with limbs, and provides unique insights into how and in what order important tetrapod characters arose is reported.
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References

SHOWING 1-2 OF 2 REFERENCES
On a Specimen of Eusthenopteron from the Old Red Sandstone of Scotland
While examining the collection of Old Red Sandstone fishes in the Royal Scottish Museum, the writer found the frontoethmoid shield of a Crossopterygian fish, from Eoghole, on the Muckle Burn, near
On the Structures of the Dermal Ethmoid Shield of Osteolepis
TLDR
The structure of the fronto-ethmoid shield of Osteolepis macrolepidotus Ag is described fully for the first time, and the homology of the dermal bones is discussed, with the recognition of a sensory-canal bone bearing teeth in the position of the premaxillary of Tetrapods.