File:Platypus and Echidna cleaving eggs.jpg

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Description Fig. 160. Cleaving eggs of Platypus and Echidna. (After Flynn and Hill, '39.) (A) Egg, shell, and early cleavage in Ornithorhynchus. (B) Early cleavage in Echidna. See fig. 161D.
Date
Source https://archive.org/details/comparativeembry00nels/page/324/mode/1up?view=theater&q=BLASTULATION+ Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illustrations.
Author Nelsen, Olin E.

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Public domain
This work is in the public domain because it was published in the United States between 1929 and 1963, and although there may or may not have been a copyright notice, the copyright was not renewed. For further explanation, see Commons:Hirtle chart and the copyright renewal logs.
Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (70 years p.m.a.), Mainland China (50 years p.m.a., not Hong Kong or Macao), Germany (70 years p.m.a.), Mexico (100 years p.m.a.), Switzerland (70 years p.m.a.), and other countries with individual treaties.

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The external site https://archive.org/details/comparativeembry00nels was reviewed on 29 October 2024 by reviewer Felix QW, who confirmed that this work was published in the US in 1953 and there were no copyright renewals listed under this title on the Stanford copyright renewals database.

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current15:25, 11 March 2024Thumbnail for version as of 15:25, 11 March 20241,288 × 707 (640 KB)Rasbak (talk | contribs){{Information |description=Fig. 160. Cleaving eggs of Platypus and Echidna. (After Flynn and Hill, '39.) (A) Egg, shell, and early cleavage in Ornithorhynchus. (B) Early cleavage in Echidna. See fig. 161D. |date=1953 |source=https://archive.org/details/comparativeembry00nels/page/324/mode/1up?view=theater&q=BLASTULATION+ Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illustrations. |author= Nelsen, Olin E. |permission= |other versions= }} =={{int:lic...

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