| FIG. | | Page |
| 1. | Hyoid Arch of the Conger.
(Original.) | [58] |
| 2. | "Vertebra" of a
Pleuronectid. (Geoffroy.) | [61] |
| 3. | Abdominal Segment of the
Lobster. (Geoffroy.) | [63] |
| 4. | Ideal Typical Vertebra.
(Owen.) | [102] |
| 5. | Natural Typical Vertebra.
(Owen.) | [103] |
| 6. | The Archetype of the
Vertebrate Skeleton. (Owen.) | [105] |
| 7. | Ideal Transverse Section
of a Vertebrate Embryo. (Von Baer.) | [119] |
| 8. | Gill-slits of the Pig
Embryo. (Rathke.) | [134] |
| 9. | Meckel's Cartilage and
Ear-ossicles in Embryo of Pig. (Reichert.) | [145] |
| 10. | Cranial Vertebræ
and Visceral Arches in Embryo of Pig. (Reichert.) | [148] |
| 11. | Embryonic Cranium of the
Adder. (Rathke.) | [152] |
| 12. | Transverse Section of
Chick Embryo. (Remak.) | [211] |
| 13. | Development of the
Ascidian Larva (Kowalevsky.) | [272] |
| 14. | Transverse Section of the
Worm Nais. (Semper.) | [280] |
| 15. | The Five Primary Stages
of Ontogeny. (Haeckel.) | [292] |