Vlll MEMOIRS OF THE CARNEGIE MUSEUM. 



34. Odontostilbe drepanon Fowler 93 



35. Odontostilbe microcephala Eigenmann 94 



36. Odontostilbe madeirce Fowler 97 



Memoir No. 2. 



1. Carapace of Baena arenosa Leidy 108 



2. Carapace of Baena inflata Gilmore 113 



3. Plastron of Baena inflata Gilmore 114 



4. Anterior lobes of Baena inflata Gilmore 116 



5. Carapace of Baena gigantea Gilmore 117 



6. Plastron of Baena gigantea Gilmore 118 



7. Lateral View of Carapace and Plastron of Baena gigantea 119 



8. Plastron of Baena platyplastra Gilmore 120 



9. Carapace of Echmatemys callopyge Hay 124 



10. Plastron of Echmatemys callopyge Hay 125 



11. Carapace of Echmatemys douglassi Gilmore 129 



12. Plastron of Echmatemys douglassi Gilmore ' 130 



13. Carapace of Echmatemys hollandi Gilmore 133 



14. Carapace of Echmatemys obscura Gilmore 137 



15. Plastron of Echmatemys obscura Gilmore 138 



16. Carapace of Echmatemys depressa Gilmore 140 



17. Portions of the Carapace and Plastron of Echmatemys pusilla? Hay 142 



18. Plastron of Hadrianus corsoni (Leidy) 145 



19. Anterior half of plastron of Hadrianus robustus Gilmore 147 



20. Plastron of Hadrianus utahensis Gilmore 149 



21. Carapace of Testudo uintensis Gilmore 152 



22. Plastron of Testudo uintensis Gilmore 153 



Memoir No. 4. 



1. Pimelodella buckleyi (Boulenger) 241 



2. Pimelodella laticeps Eigenmann 243 



Memoir No. 5. 



1. Phylogenetic tree of the Pygidiida? 277 



2. Details of structure of skulls of Hatcheria patagoniensis Eigenmann and 



Scleronema operculatus Eigenmann 282 



3. Hatcheria patagoniensis Eigenmann 283 



4. Hatcheria areolata (Cuvier & Valenciennes) 286 



5. Hatcheria burmeisteri (Berg.) 286 



6. Hatcheria macrcei (Girard) 287 



7. Pygidium tenue (Weyenbergh) 293 



