IV 
TABLE OF CONTENTS. 
Class IV.—AMPHIBIA. 
PAGE 
Order I. —Anura or Ecaudata (Tail-less) .... 45 
,, II. —Urodela or Caudata (Tailed) ..... 45 
„ III. —Stegocephalia (Roof-headed) ..... 46 
Sub-order 1. —Labyrinthodontia (Labyrinth-toothed) . 47 
„ 2. —Microsauria (Little-lizards) ... 49 
„ 3. —Aistopoda (Unseen-footed) .... 50 
,, 4. —Branchiosauria (Grilled-lizards) ... 50 
Fossil Footprints .. 51 
Class V.—AGNATHA (Without -jaws). 
Order I.—Ostracodermi (Shell-skinned) .... 58 
Sub-order 1 .—Anaspida (Without-shields) ... 54 
,, 2.—Heterostraci (Anomalous-shelled) . . 54 
,, 3.—Osteostraci (Bony-shelled) ... 57 
,, 4.—Antiarchi (Against-rule) .... 58 
Order II.—Cyclic (Circled) ....... 60 
Conodonts (Cone-teeth) ....... 60 
Class VI.—PISCES ^(Fishes). 
Table of Classification ........ 62 
Sub-class I.—Elasmobranchii (Plate-gilled) .... 63 
Order 1 1 .—Acanthodii (Spiny).63 
„ II.—Pleuropterygii (Rib-finned) .... 64 
,, III.—Ichthyotomi (Fish-segmented) ... 65 
,, IV.—Selachii (Sharks and Skates) .... 67 
Sub-order 1 .—Asterospondyli (Star-vertebras) . . 68 
„ 2.—Tectospondyli (Covered-vertebrae) . 72 
Sub-class II.—Holocephali (Whole-headed) . . . .75 
„ III.—Dipnoi (Double-breathers) .... 76 
Order I.—Sirenoidei (Siren-like) . . . . .76 
„ II.—Arthrodira (Joint-necked) . 79 
Sub-class IV.—Teleostomi (Complete-mouthed) ... 81 
Order I.—Crossopterygii (Fringe-finned) ... 81 
„ II.—Actinopterygii (Ray-finned) .... 84 
Sub-order 1 .—Chondrostei (Gristle-boned) . . 84 
,, 2.—Protospondyli (First-vertebrae) . . 89 
,, 3.—Aetheospondyli (Varied-vertebrae) . 93 
„ 4.—Isospondyli (Uniform-vertebrae) . . 94 
,, 5.—Ostariophysi (Bony-bladders) . 99 
,, 6.—Apodes (Limb-less) .... 99 
,, 7.—Anacanthini (Without-spines) . . 100 
,, 8.—Percesoces (Perch-pikes) . . . 100 
,, 9.—Hemibranchii (Half-gilled) . . . 100 
„ 10.—Acanthopterygii (Spiny-finned) . . 100 
