INDEX OF PLATES. 



5 6, 



8. Agomphus pectoralis. Both hyoplastra of type, lower surface. X 0.5. 



9. Agomphus pectoralis. Same bones seen from in front. X 0.5. 



10. Zygoramma striatula. Inner surface of a bridge peripheral of type, showing end of rib. 



X 0.4. In A. M. N. H. 



11. Baptemys wyomingensis. Skull seen from above. X 0.75. No. 484 Yale Univ. coll. 



12. Baptemys wyomingensis. Same skull seen from below, x 0.75. 

 [3, Baptemys wyomingensis. Same skull seen from side, x 0.75. 



Plate 38. 



1. Zygoramma striatula. Both hypoplastra of type. X 0.5. In A. M. N. II. 



2. Zygoramma striatula. Three peripherals and part of costal of type. X 0.5. 



3. Zygoramma striatula. Same bones, inner surface. X 0.5. 



4. Hoplochelys crassa. Sixth right peripheral of type, outer surface. X 1. No. 6091 



' A. M. N. H. 



5. Hoplochelys crassa. Same bone, inner surface. X 1. 



6. Hoplochelys crassa. Fourth or fifth peripheral of type, outer surface. X 1. 



7. Hoplochelys crassa. Same bone, inner surface. X 1. 



8. Hoplochelys crassa. Proximal ends of two costals of type, showing lateral carina. 



9. Hoplochelys crassa. Pygal of type. X 1. 



10. Baptemys wyomingensis. Skull seen from above. X 1. No. 5967 A. M. N. H. 



Plate 39. 



1. Alamosemys substricta. Carapace of type. X 0.25. No. 1204 A. M. N. H. 



2. Alamosemys substricta. Plastron of type. X 0.25. 



Plate 40. 



1. Baptemys wyomingensis. Carapace. X I/3. No. 1494 A. M. N. H. 



2. Naomichelys speciosa. Entoplastron forming tvpe, outer surface. X 0.75. No. 6136 



A. M. N. H. 



3. Naomichelys speciosa. Same bone, inner surface. X 0.75. 



Plate 41. 



1. Baptemys wyomingensis. Carapace. X 0.28. No. 5967 A. M. N. H. 



2. Baptemys wyoiiiingeiisis. Plastron of same specimen. X 0.28. 



Plate 42. 



1. Baptemys fluviatilis. Carapace of type. X 0.24. Geol. Dept. A. M. N. H. 



2. Baptemys fluviatilis. Plastron of type. X 0.24. 



Plate 43. 



1. Anosteira ornata. Carapace. X 1. No. 6132 A. M. N. H. 



2. Anosteira ornata. Plastron. X I. 



Plate 44. 



1. Gyremys spectabilis. Carapace of type. X 0.25. No. 1171 A. M. N. H. 



2. Gyremys spectabilis. Plastron of type. X 0.25. 



Plate 45. 



1. Clemmys morrisia. Anterior lobe of plastron of tvpe, upper surface. X 0.8. No. 6029 



A.M. X.H. 



2. Clemmys morrisia;. Part of right side of hinder lobe of plastron, upper surface. X 0.8. 



No. 6029 A. M. N. H. 



3. Clemmys morrisiie. Upper surface of left xiphiplastron. X 0.8. No. 6025 A. M. N. H. 



4. Clemmys hesperia. Left hyoplastron. Type. X 1. No. 2219 Univ. Cal. coll. 



5. Clemmys hesperia. Right cpiplastron. X 1. No. 2179 Univ. Cal. coll. 



6. Clemmys hesperia. First right peripheral. X 1. No. 2179 Univ. Cal. coll. 



7. Clemmys hesperia. Ninth left peripheral X 1. No. 552 Univ. Cal. coll. 



