LIST OF PLATES 



PLATE i. 



FIGURES FROM DRAWINGS FURNISHED BY U. S. GEOL. SURVEY. 



1. Colpochelys kempi. Skull, upper aspect. X 2 /$. U. S. N. M. 



2. Colpochelys kempi. Same skull, lower aspect. X 2 /$. 



3. Colpochelys kempi. Lower jaw of same skull, seen from above. X 2 /$. 



4. Colpochelys kempi. Same lower jaw, seen from side. X y$. 



5. Platypeltis ferox. Lower jaw, lateral view. X 2 /j. U. S. N. M. 



PLATE 2. 

 FIGURES FROM DRAWINGS FURNISHED BY U. S. GEOL. SURVEY. 



1. Colpochelys kempi. Skull, left side. X y$. Same specimen as Figs, i to 4, PI. I. 



2. Colpochelys kempi. Left scapula and coracoid. X 2 /z. Yale Univ. coll. No. 638. 



3. Colpochelys kempi. Left humerus, dorsal aspect. X 2 /$. 



4. Colpochelys kempi. Same humerus, ventral aspect. X 2 /$. 



5. Colpochelys kempi. Left femur, dorsal aspect. X y$. 



6. Colpochelys kempi. Same femur, ventral aspect. X %. 



PLATE 3. 



FIGURES FROM DRAWINGS FURNISHED BY U. S. GEOL. SURVEY. 



1. Platypeltis ferox. Skull, upper view. X 2 / 3 . U. S. N. M. 



2. Platypeltis ferox. Same skull, lower view. X y$. 



3. Platypeltis ferox. Left scapula and coracoid. X y$. cor, coracoid; pcor, procoracoid 



process ; scap, scapula. 



4. Platypeltis ferox. Left humerus, dorsal view. X 2 /j. 

 $. Platypeltis ferox. Same humerus, ventral view. X y$. 



6. Platypeltis ferox. Left femur of same individual, dorsal aspect. X y$. 



7. Platypeltis ferox. Same femur, ventral aspect. X */$. 



PLATE 4. 

 FIGURES FROM DRAWINGS FURNISHED BY U. S. GEOL. SURVEY. 



1. Podocnemis expansa. Skull, seen from above. X y$. U. S. N. M. 



2. Podocnemis expansa. Same skull, from below. X 0.5. 



3. Podocnemis expansa. Lower jaw of same individual. X y$. any, angular; art, articular; 



dart, dermarticular, or prearticular ; dent, dentary; spl, splenial. 



4. Podocnemis expansa. Lower jaw of same specimen from left side. X 0.5. sur, sur- 



angular. 



5. Podocnemis expansa. Skull seen from side. X 0.5. Same individual as that of Fig. i. 



PLATE 5. 



1. Glyptops plicatulus. Costal; part of type. X i. No. 6099 A. M. N. H. 



2. Glyptops plicatulus. Skull viewed from side X i. Yale Univ. coll. No. 1357. 



3. Glyptops plicatulus. Skull, upper aspect. X i. No. 336 A. M. N. H. 



4. Glyptops plicatulus. Same skull, lower aspect. X i. 



5. Glyptops plicatulus. Plastron. X 0.25. Yale Univ. coll. No. 165. Drawing from U. S. 



Geol. Survey. 



PLATE 6. 

 Glyptops plicatulus. Carapace, skull and neck. X 0.5. No. 336 A. M. N. H. 



PLATE 7. 



1. Glyptops calatus. First costal, first and second peripherals. X i. No. 1930 U. S. N. M. 



2. Glyptops ccelatus. Fragment of costal. X i. No. 1930 U. S. N. M. 



3. Glyptops? behiderensis. Neural, lower surface. X i. Type in Colorado College coll. 



4. Glyptops behiderensis. Distal part of costal of type. X i. 



5. Probaena sculpta. Plastron of type. X i. In Carnegie Mus. 



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