INDEX OF PLATES. r(>2 



PLATE 55. 

 Tracheinys hilli. Carapace of type. X 0.7. No. 2425 A. M. N. H. 



PLATE 56. 



1. Trachemys bisornata. Part of carapace. X 0.8. Specimen in coll. Phila. Acad. 



2. Trachemys trulla. Part of epiplastra, lower surface. X 0.8. Type, No. 3934 A. M. N. H. 



3. Trachemys trulla. Same bones, upper surface. X 0.8. 



4. Trachemys trulla. Right hyoplastron of type. X 0.8. 



5. Trachemys trulla. Right hypoplastron of type. X 0.8. 



6. Trachemys trulla. Left xiphiplastron of type. X 0.8. 



7. Terrapene putnami. Left hyoplastron forming type. X 2 / 3 . In A. M. N. H. 



8. Terrapene putnami. Same bone showing lateral hinge. X ft. 



PLATE 57. 



1. Pseudemys ccelata. Nuchal. 



2. Pseudemys ccelata. Fifth left costal. 



3. Pseudemys ccelata. Left third peripheral. 



4. Pseudemys ccelata. Left tenth peripheral. 



5. Pseudemys ccelata. Left hypoplastron. 



6. Pseudemys ccelata. Left first costal of smaller individual. 



All figures slightly less than natural size. From type, No. 2508 U. S. N. M. 



PLATE 58. 



1. Terrapene marnochi. Carapace, side view. X 0.623. No. 3936 A. M. N. H. 



2. Terrapene marnochi. Same carapace, upper view. 



PLATE 59. 



1. Hadrianus majusculus. Shell of the type. X 0.25. In Yale Univ. coll. 



2. Stylemys nebrasccnsis. Skull, upper side. X i. Princeton Univ. coll. 



3. Stylemys nebrasccnsis. Same skull, lower side. X i. 



4. Stylemys nebrasccnsis. Egg. X i. A. M. N. H. 



PLATE 60. 

 Hadrianus corsoni. Carapace. X 0.375. No. 6027 A. M. N. H. 



PLATE 61. 

 Hadrianus corsoni. Plastron. X 0.375. No. 6027 A. M. N. H. 



PLATE 62. 



1. Stylemys nebrascensis. Carapace. X 0.5. No. 1433 A. M. N. H. 



2. Stylemys nebrascensis. Plastron of same shell. X 0.5. 



PLATE 63. 



1. Stylemys capax. Carapace of type. X 0.28. No. 1357 A. M. N. H. 



2. Stylemys capax. Plastron of type. X 0.28. 



PLATE 64. 

 i. Stylemys conspccta. Carapace of type. X 0.45. No. 1358 A. M. N. H. 



PLATE 65. 



1. Testudo brontops. Carapace of type. X 0.15. In Yale Univ. coll. 



2. Testudo brontops. Plastron of type. X 0.15. 



PLATE 66. 



1. Testudo thomsoni. Front of plastron of type. X 0.5. No. 3940 A. M. N. H. 



2. Testudo thomsoni. Skull of type, upper side. X 0.8. 



