For convenience of reference, the system of classification of the animals and plants which has been used in the book is here given in tabular form, omitting those groups which possess no importance as fossils. Groups marked with an asterisk (*) are extinct.

Sub-Kingdom I. Protozoa

Class i. Rhizopoda.

Order 1. Foraminfera.

2. Radiolaria.

Sub-Kingdom II. Ccelenterata

Sub-Branch A. Porifera. Class I. Spongia, Sponges.

Sub-Class 3. Silicispongia, Siliceous Sponges.

4. Calcispongia, Calcareous Sponges. Sub-Branch B. Cnidaria. Class 1. Anthozoa.

Sub-Class 1. *Tetracoralla, Palaeozoic Corals.

2. Hexacoralla, Modern Corals.

3. Octocoralla, Modern Corals. Class 2. Hydrozoa.

Sub-Class 1. Hydromedusae.

Order 2. Hydrocorallince, Hydroid Corals.

3. TubularicB, Organ Corals.

4. *Graptolitoidea, Graptolites. Sub-Class 2. Acalephae, Jellyfishes.

Sub-Kingdom III. Echinodermata

Sub-Branch A. Pelmatozoa. Class 1. Crinoidea, Sea Lilies. Order 1. *Inadunata.

2. *Camerata.

3. Articulata. Class 2. *Cystoidea.

3. *Blastoidea. Sub-Branch B. Asterozoa.

Class 1. Ophiuroidea, Brittle Stars. 2. Asteroidea, Starfishes. Sub-Branch C. Echinozoa.

Class 1. Echinoidea, Sea-urchins. Sub-Class 1. *Palaeechinoidea. 2. Euechinoidea. Order 1. Regulares, Regular Sea-urchins.

2. Irregulares, Spantangoids, Sand-dollars. Class 2. Holothuroidea, Sea Cucumbers.

Sub-Kingdom IV. Vermes

Worms.

Sub-Kingdom V. Bryozoa

Sea Mosses.

Sub-Kingdom VI. Brachiopoda

Lamp Shells. Order I. Inarticulata. 2. Articulata.

Sub-Kingdom VII. Mollusca

Class I. Pelecypoda, Bivalves.

2. Scaphoda, Tusk-shells.

3. Amphineura^

4. Gastropoda, Conchs, Whelks, Cowries, etc.

5. Pteropoda.

6. Cephalopoda. Sub-Class 1. Tetrabranchiata.

Order 1. Nautiloidea, Pearly Nautilus. 2. *Ammonoidea, Ammonites. Sub-Class 2. Dibranchiata.

Order 1. *Belemnoidea, Belemnites.

2. Sepioidea, Cuttlefishes, Squids.

3. Octopoda, Octopuses.

Sub-Kingdom VIII. Arthropoda

Class 1. Crustacea.

Sub-Class 1. Merostomata. Order 1. *Eurypterida.

2. Xiphosura, Horse-shoe Crabs.

3. *Synxiphosura. Sub-Class 2. *Trilobita.

Sub-Class 3. Eucrustacea, Typical Crustacea. Super-Order 1. Phyllopoda.

3. Ostracoda.

4. Cirripedia, Barnacles.

5. Malacostraca. Order 1. Phyllocarida.

2. Schizopoda.

3. Stomatopoda.

4. Decapoda.

Sub-Order a. Macrura, Lobsters, etc. b. Brachyura, Crabs. Class 2. Arachnida, Spiders and Scorpions.

3. Myriapoda, Centipedes.

4. Insecta, Insects.

Order 1. Orthoptera, Cockroaches, Grasshoppers, etc.

2. Neuroptera, Caddis-flies, Ant-lions, etc.

3. Hemiptera, Cicadas, etc.

4. Diptera, Flies.

5. Lepidoptera, Butterflies and Moths.

6. Coleoptera, Beetles.

7. Hymenoptera, Bees, Wasps, Ants, etc.

Sub-Kingdom IX. Vertebrata

Class 2. *Ostracodermata. 3. Pisces, Fishes. Sub-Class 1. Selachii, Sharks, Rays, etc.

2. Holocephali, Chimaeras, or Spook-fishes.

3. Dipnoi, Lung-fishes.

4. *Arthrodira.

5. Teleostomi. Order 1. Crossopterygii.

2. Actinopteri.

Sub-Order 1. Chondrostei or Ganoids, Sturgeon, Gar-pike, etc 2. Teleocephali or Teleosts, Herring, Salmon, etc. Class 3. Amphibia.

Order I. *Stegocephali.

3. Urodela, Mud-puppies, Salamanders.

4. Anura, Frogs and Toads. Class 4. Reptilia.

Super-Order *Theriodontia.

Order 1. *Cotylosauna.

2. * Therocephalia.

3. *Cynodontia.

4. *Anomodontia. Order 5. *Placodontia.

6. *Plesiosauna.

7. Testudinata, Tortoises and Turtles. Super-Order Diaptosauria.

Order 8. *Proeolophoma.

9. *Proterosauria.

10. *Proganosauria.

11. *Gnathodontia.

12. *Pelycosauria.

13. *Choristodera.

14. Rhynchocephalia, New Zealand Lizard.

Order 15. *Parasnchia.

16. *Ichthyosauria.

17. *Thalattosauria.

18. Crocodilia.

Sub-Order a. Mesosuchia, Crocodiles, Alligators. b. *Thalattosuchia. Super-Order *Dinosauria.

Order 19. *Theropoda.

20. *Opisthoccelia.

21. *Orthopoda.

Super-Order Squamata.

Order 22. Lacertilia, Lizards.

23. *Mosasauria.

24. Ophidia, Snakes.

Order 25. *Pterosauria. Class 5. Aves, Birds.

Order 1. *Saururce (Archaeopteryx).

2. Ratitce, Wingless Birds, Ostriches, etc.

3. Carinata, Flying Birds. Class 6. Mammalia.

Sub-Class 1. Prototheria.

Order I. Monotremata, Spiny Ant-eater, Duck-billed Mole. 2. *Multituberculata. Sub-Class 2. Eutheria.

Super-Order 1. Marsupialia, Opossum, Kangaroo, etc.

2. Placentalia, Placentals. Order I. Edentata, Sloths, Armadillos, etc.

2. Cetacea, Whales, etc.

3. Sirenia, Sea-cows and Dugongs.

4. Insectivora, Moles, Hedgehogs, etc.

5. Cheiroptera, Bats.

6 *Creodonta, Primitive Flesh-eaters.

7. Carnivora, Dogs, Cats, Bears, Seals, etc.

8. * Tillodonta.

9. * Tceniodonta.

10. Rodentia, Rats, Porcupines, Squirrels, Hares, etc.

11. *Condylarthra.

12. *Amblypoda.

13. *Typotheria.

14. *Toxodontia.

15. *Homalodotheria.

16. *Astrapotheria.

17. *Litopterna.

18. Hyracoidea, Dassies.

19. Proboscidea, Elephants.

20. Artiodactyla, Pigs, Camels, Deer, Antelopes, etc.

21. Perissodactyia, Horses, Tapirs, Rhinoceroses.

22. *Ancylopoda.

23. Lemuroidea, Lemurs.

24. Primates, Monkeys, Apes, Man.