LIST OF PLATES 



Plate i. 

 figures from drawings furnished by u. s. geol. survey. 



1. Colpochelys kempi. Skull, upper aspect, x 2 /y U. S. N. M. 



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



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



4. Colpochelys kempi. Same lower jaw, seen from side. X 2 /$. 



5. Platypeltis ferox. Lower jaw, lateral view. X $. U. S. N. M. 



Plate 2. 

 figures from drawings furnished by u. s. geol. survey. 



1. Colpochelys kempi. Skull, left side. X 2 /$. Same specimen as Figs. 1 to 4, PI. 1. 



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



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



4. Colpochelys kempi. Same humerus, ventral aspect. X %. 



5. Colpochelys kempi. Left femur, dorsal aspect. X 2 /$. 



6. Colpochelys kempi. Same femur, ventral aspect. X 2 /t,. 



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 %. 



3. Platypeliis ferox. Left scapula and coracoid. X 2 /t,. cor, coracoid ; pcor, procoracoid 



process ; scap, scapula. 



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



5. Platypeltis ferox. Same humerus, ventral view. X %. 



6. Platypeltis ferox. Left femur of same individual, dorsal aspect. X 2 /s. 



7. Platypeltis ferox. Same femur, ventral aspect. X %. 



Plate 4. 

 figures from drawings furnished by u. s. geol. survey. 



1. Podocnemis cxpansa. Skull, seen from above. X 2 /z. U. S. N. M. 



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



3. Podocnemis expanse. Lower jaw of same individual. X 2 /j,. any, angular; art, articular; 



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



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



angular. 



5. Podocnemis cxpansa. Skull seen from side. X 0.5. Same individual as that of Fig. I. 



Plate 5. 



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



2. Glyptops plicatulus. Skull viewed from side X 1. Yale Univ. coll. Xo. 1357. 



3. Glyptops plicatulus. Skull, upper aspect. X 1. No. 336 A. M. N. H. 



4. Glyptops plicatulus. Same skull, lower aspect. X 1. 



5. Glyptops plicatulus. Plastron. X 0.25. Vale 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 catlatus. First costal, first and second peripherals. X 1. No. 1930 U. S. N. M. 



2. Glyptops ca-hitus. Fragment of costal, x 1. Xo. 1930 U. S. N. M. 



3. Glyptops' belviderensis. Neural, lower surface, x 1. Type in Colorado College coll. 



4. Glyptops belviderensis. Distal part of costal of type. X 1. 



5. Probaena sculpta. Plastron of type. X 1. In Carnegie Mus. 



557 



