to 
No 
. Baptemys wyomingensis. Skull seen from above. ™* 1. No. 5067 A.M.N.H. 
PLATE 30. 
. Alamosemys substricta. Carapace of type. 0.25. No.1204 A. M.N.H. 
. Alamosemys substricta, Plastron of type. X 0.25. 
PLATE 40. 
. Baptemys wyomingensis. Carapace. 1%. No.1494A.M.N. H. 
. Naomichelys speciosa. Entoplastron forming type, outer surface. 0.75. 
A.M.N.H. 
. Naomichelys speciosa. Same bone, inner surface. X 0.75. 
PLATE 4I. 
. Baptemys wyomingensis. Carapace. X 0.28. No. 5067 A. M.N.H. 
. Baptemys wyomingensis. Plastron of same specimen. 0.28. 
PLATE 42. 
. Baptemys fluviatilis. Carapace of type. 0.24. Geol. Dept. A. M. N. H. 
. Baptemys fluviatilis. Plastron of type. 0.24. 
PLATE 43. 
. Anosteira ornata. Carapace. X 1. No. 6132 A.M.N.H. 
. Anosteira ornata. Plastron. X 1. 
PLATE 44. 
1. Gyremys spectabilis, Carapace of type. 0.25. No.1171 A.M.N.H. 
. Gyremys spectabilis. Plastron of type. X 0.25. 
PLATE 45. 
NOU B 
. Clemmys morrisia. 
. Clemmys hesperia. 
. Clemmys hesperia. 
. Clemmys hesperia. 
. Clemmys hesperia. 
. Agomphus pectoralis. 
. Agomphus pectoralis. 
. Zygoramma striatula, 
. Zygoramma striatula, 
. Zygoramma  striatula. 
. Zygoramma striatula. 
. Hoplochelys crassa. 
A.M.N, 
. Hoplochelys crassa. 
. Hoplochelys crassa. 
. Hoplochelys crassa. 
. Hoplochelys crassa. 
. Hoplochelys crassa. 
INDEX OF PLATES. 
Both hyoplastra of type, lower surface. 
Same bones seen from in front. 0.5. 
X 0.5. 
561 
Inner surface of a bridge peripheral of type, showing end of rib. 
x04. In A.M.N.H. 
. Baptemys wyomingensis. Skull seen from above. 0.75. 
. Baptemys wyomingensis. Same skull seen from below. 0.75. 
. Baptemys wyomingensis. Same skull seen from side. » 0.75. 
PLATE 38. 
Both hypoplastra of type. ™ 0.5. 
Three peripherals and part of costal of type. 
Same bones, inner surface. X 0.5. 
Sixth right peripheral of type, outer surface. 
Fie 
Same bone, inner surface. ™ 1. 
Fourth or fifth peripheral of type, outer surface. 
Same bone, inner surface. ™ 1. 
In A. M. N. H. 
085: 
x I. 
ool 
No. 484 Yale Univ. coll. 
No, 6091 
Proximal ends of two costals of type, showing lateral carina. 
Pygal of type. XI. 
. Clemmys morrisie. Anterior lobe of plastron of type, upper surface. 
A.M.N.H. 
No. 6029 A. M. N. H. 
Upper surface of left xiphiplastron. 
Ninth left peripheral. 
x 0.8. 
x1. 
No. 552 Univ. Cal. coll. 
No. 6136 
x 0.8. No. 6029 
. Clemmys morrisie. Part of right side of hinder lobe of plastron, upper surface. 
coll, 
Left hyoplastron. Type. 1. No. 2219 Univ. Cal. 
Right epiplastron. 1. No. 2179 Univ. Cal. coll. 
First right peripheral. 1. No. 2179 Univ. Cal. coll. 
X 0.8. 
No. 6025 A. M. N. H. 
