INDEX OF PLATES. 



565 



Plate 79. 



1. Tcstudo orthopygia. Carapace. X 0.4. Mostly from Xo. 2415, but partly from Nos. 3931 



and 2320 A. M. N. H. Represents young individuals called by Cope Xerobatcs 

 cyclopygia. 



2. Tcstudo orthopygia. Plastron. X 0.4. Mostly from Xo. 2415, but partly from Xo. 3931 



A. M. X. H. Form called by Cope Xerobatcs cyclopygia. 



Plate 80. 



1. Tcstudo orthopygia. Shell, side view. X 0.4. Restored from same specimens as figures 



of Plate 79. 



2. Tcstudo gilbcrti. Skull of type, seen from above. X 0.75. From type in coll. Univ. Kansas. 



3. Tcstudo gilbcrti. Same skull seen from below. X 0.75. 



4. Tcstudo gilbcrti. Same skull, right side. X 0.75. 



5. Tcstudo gilbcrti. Lower jaw of same skull. X 0.75. 



Plate 81. 

 Tcstudo orthopygia. Carapace. X 0.25. Xo. 6108 A. M. X. H. 



Plate 82. 

 Tcstudo orthopygia. Plastron. X 0.25. Xo. 6108 A. M. X. H. 



Plate 83. 

 from photographs furnished by carnegie mus., pittsburg. 



1. Tcstudo cda. Carapace of type. X 0.3. Xo. 1535 Carnegie Mus. 



2. Tcstudo edec. Plastron of type. X 0.3. 



Plate 84. 

 from photographs furnished by carnegie mus., pittsburg. 



1. Tcstudo hollandi. Carapace of type. X y 3 . X0.1561 Carnegie Mus. 



2. Tcstudo hollandi. Plastron of type. X y$. 



Plate S5. 



1. Plastomcnus costatus. Costal bone. Slightly reduced. Xo. 6131 A. M. N. H. 



2. Plastomcnus costatus. Right xiphiplastron. Slightly reduced. X'o. 6131 A. M. N. H. 



3. Plastomcnus nwlopinus. Carapace. X 0.6. Xo. 5941 A. M. X". H. 



Plate 86. 

 reproduction of figures by cope. 



1. Plastomcnus catcnatus. Fragment of costal. X 1. Xo. 1138 U. S. X. M. 



2. Plastomcnus? leptomitus. Fragment of costal. X 1. Xo. 1113 U. S. N. M. 



3. Plastomcnus. ' lachrymalis. Fragment of costal. X 1. a, view of edge of fragment. 



4. Plastomcnus* fractus. Fragments of costals. X 1. Types lost, w, x, the proximal 



end of a costal, showing both surfaces ; y, c, fragments of two costals. 



5. Plastomenus corrugatus. Part of left hypoplastron. x 1. Original lost. 



6. Plastomcnus communis. Two peripherals. X 1. a. seen from above; b, view of edge. 



Type. No. I.132U. S.N.M. 



7. Plastomcnus communis. Two peripherals of type. X 1. 



8. Plastomcnus communis. Fragment of hyoplastron of type. X 1. 



9. Amyda cariosa. Neural. X 1. Type. Xo. 2575 U. S. X. M 



10. Amyda cariosa. Fragment of costal of type. X 1. 



11. Amyda radula. Fragment of costal of type. X 1. Xo. 2581 U. S. X. M. 



12. Amyda radula. Fragment of costal of type. X 1. 



Plate 87. 



1. Plastomenus visendus. Carapace, x 0.5. Type. Xo. 1895 A. M. X. H. 



2. Plastomcnus visendus. Plastron of same specimen. X 0.5. 



