Fig. 31. A, Pleurodiran skull: Podocnemis, from below. B, the same, from the side. 

 One half natural size. C, Trionychoid mandible Piatypeltis, from the inner side. 

 Three halves natural size. D,Cryptodiran skull, T/w/^jjofA^/yj, occiput. One half 

 natural size. E, Cryptodiran skull, Colpochelys, from above. One half natural size. 



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