--------------------------------------------------- ORDER. | ---- | SUB-ORDER. |GROUPS. | | | | | -----------|----------|------------------|--------| Chelonia. |Land |1. Testudinea | | | tortoises| | | " |River and |2. Emydea |a Terra-| | marsh do.| | penes| | | |b Chelo-| | | | dines| |Mud |3. Trionychoidea | | | tortoises| | | " |Turtles |4. Euereta | | | | | | Plesiosaur-| |5. |Post | ia. | | | Trias- | | | | sic | " | |6. |Triassic| | | | | | | | | | | | | Lacertilia.|Geckos |7. Ascalabota | | | | | | " | |8. Rhynchocephala | | | | | | " | |9. Homœosauria | | | | | | | | | | " | |10. Protosauria | | | | | | " |Monitor |11. Platynota | | | | | | " | |12. Eunota | | | | | | " | |13. Lacertina | | | | | | " | |14. Chalcidea | | | | | | " | |15. Scincoidea | | " | |16. Dolichosauria | | " | |17. Mosasauria | | " | |18. Amphisbænoida | | " | |19. Chamæleonida | | Ophidia. |Non-vene- |20. Aglyphodontia | | | mous con-| | | " | stricting|21. Opisthoglyphia| | " | |22. Proteroglyphia| | " |Vipers and|23. Solenoglyphia | | | Rattle- | | | " | snakes |24. Typhlopidæ | | Icthyosaur-| | . . . . | | ia. | | | | Crocodile. |Alligator |26. Alligatoridæ | | | | | | | | | |