{ { (_Scolecida_) { and Gliding worms { { { { 8. Sack worms { Sea-squirts { { (_Himatega_) { (_Ascidiæ_) { { M.................................................N { { 9. Skull-less { Lancelets { { (_Acrania_) { (_Amphioxi_) { { { { 10. Single-nostriled { Lampreys { { (_Monorrhina_) { (_Petromyzonta_) { (Compare p. 22, and { { Plate XIV. and its { 11. Primæval fish { Sharks { explanation.) { (_Selachii_) { (_Squalacei_) --------------------------------------------------------------------------------------------------- { 4. Devonian Period { 12. Salamander fish { Mud fish II. { { (_Dipneusta_) { (_Protopteri_) PALÆOLITHIC { 5. Coal Period { OR { { 13. Gilled Amphibia { (_Proteus_) { 6. Permian Period { (_Sozobranchia_) { Axolotl (_Siredon_) PRIMARY { { EPOCH { { 14. Tailed Amphibia { Water-newts { { (_Sozura_) { (_Tritons_) --------------------------------------------------------------------------------------------------- { { 15. Primæval Amniota { ?Between the Tailed-Amphibia III. { { (_Protamnia_) { and Primary MESOLITHIC { 7. Trias Period { { mammals OR { { { 8. Jura Period { 16. Primary Mammals { Beaked animals SECONDARY { { (_Promammalia_) { (_Monotrema_) EPOCH { 9. Chalk Period { { { 17. Pouched animals { Pouched rats { { (_Marsupialia_) { (_Didelphys_) --------------------------------------------------------------------------------------------------- { { 18. Semi-apes { Lori (_Stenops_) { { (_Prosimiæ_) { Maki (_Lemur_) { { IV. { { 19. Tailed Narrow-nosed { Nose apes CENOLITHIC { 10.