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Fig. 31. A, Pleurodiran skull: Podocnemis, from below. B, the same, from the side. One half natural size. C, Trionychoid mandible Platypeltis, from the inner side. Three halves natural size. D, Cryptodiran skull, Thalassochelys, occiput. One half natural size. E, Cryptodiran skull, Colpochelys, from above. One half natural size.
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