ILLUSTRATIONS
Reading edition
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