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Lisl OF -PLATES 
PLATE I. 
FIGURES FROM DRAWINGS FURNISHED BY U. S. GEOL. SURVEY. 
. Colpochelys kempi. Skull, upper aspect. X 7% U.S.N.M. 
. Colpochelys kempi. Same skull, lower aspect. X %. 
. Colpochelys kempi. Lower jaw of same skull, seen from above. X %. 
. Colpochelys kempi. Same lower jaw, seen from side. X %. 
. Platypeltis ferox. Lower jaw, lateral view. X %. U.S.N.M. 
PLATE 2. 
FIGURES FROM DRAWINGS FURNISHED BY U. S, GEOL. SURVEY. 
. Colpochelys kempi. Skull, left side. 24. Same specimen as Figs. 1 to 4, Pl. 1. 
. Colpochelys kempi. Left scapula and coracoid. x 7%. Yale Univ. coll. No. 638. 
. Colpochelys kempi. Left humerus, dorsal aspect. X 7%. 
. Colpochelys kempi. Same humerus, ventral aspect. * %. 
. Colpochelys kempi. Left femur, dorsal aspect. * %. 
. Colpochelys kempi. Same femur, ventral aspect. X %. 
PLATE 3. 
FIGURES FROM DRAWINGS FURNISHED BY U. S. GEOL. SURVEY. 
. Platypeltis ferox. Skull, upper view. X %. U.S.N.M. 
. Platypeltis ferox. Same skull, lower view. X %. 
. Platypeltis ferox. Left scapula and coracoid. x %. cor, coracoid; peor, procoracoid 
process; scap, scapula. 
. Platypeltis ferox. Left humerus, dorsal view. 7%. 
. Platypeltis ferox. Same humerus, ventral view. %. 
. Platypeltis ferox. Left femur of same individual, dorsal aspect. 
. Platypeltis ferox. Same femur, ventral aspect. X 24. 
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PLATE 4. 
FIGURES FROM DRAWINGS FURNISHED BY U. S. GEOL. SURVEY. 
. Podocnemis expansa. Skull, seen from above. X 7%. U.S.N.M. 
. Podocnemis expansa. Same skull, from below. 0.5. 
. Podocnemis expansa. Lower jaw of same individual. %. ang, angular; art, articular ; 
dart, dermarticular, or prearticular; dent, dentary; spl, splenial. 
. Podocnemis expansa. Lower jaw of same specimen from left side. 0.5. sur, sur- 
angular. 
. Podocnemis expansa, Skull seen from side. 0.5. Same individual as that of Fig. 1. 
PLATE 5. 
. Glyptops plicatulus. Costal; part of type. 1. No.6099 A. M.N. H. 
. Glyptops plicatulus. Skull viewed from side * 1. Yale Univ. coll. No. 1357. 
. Glyptops plicatulus. Skull, upper aspect. * 1. No, 336A. M.N.H. 
. Glyptops plicatulus. Same skull, lower aspect. ™ 1. 
. Glyptops plicatulus. Plastron. 0.25. Yale Univ. coll. No. 165. Drawing from U.S. 
Geol. Survey. 
PLATE 6. 
Glyptops plicatulus. Carapace, skull and neck. 0.5. No. 336 A. M. N. H. 
PLATE 7. 
. Glyptops c@latus. First costal, first and second peripherals. 1 No. 1930 U. S. N. M. 
. Glyptops celatus. Fragment of costal. * 1. No. 1930 U.S. N.M. 
. Glyptops? belviderensis. Neural, lower surface. X I. Type in Colorado College coll. 
. Glyptops belviderensis. Distal part of costal of type. * 1. 
Probaéna sculpta. Plastron of type. 1. In Carnegie Mus. 
Bo7 
