ILLUSTRATIONS
PLATES
| TO FACE PAGE | ||
| 1. | Cambrian Trilobites (Bathyuriscus, Albertella, Burlingia, Oryctocara) | 42 |
| 2. | Cambrian Trilobites (Albertella) | 44 |
| 3. | "" (Zacanthoides) | 46 |
| 4. | "" (Neolenus) | 48 |
| 5. | "" (Neolenus) | 50 |
| 6. | "" (Neolenus) | 52 |
| 7. | Cambrian Brachiopoda (Atremata) | 118 |
| 8. | "" (Atremata and Neotremata) | 120 |
| 9. | "" (Neotremata and Protremata) | 122 |
| 10. | "" (Protremata) | 124 |
| 11. | Schematic Diagram of evolution of Cambrian Brachiopoda | 140 |
| 12. | Microphotographs of brachiopod shell sections | 164 |
| 13. | Map of House Range, Millard County, Utah | 172 |
| 14. | West face of Notch Peak, House Range, Utah | 173 |
| 15. | Fig. 1. Eastern side of the House Range south of Marjum Pass, Utah | 178 |
| Fig. 2. Ridge east and southeast of Antelope Springs, House Range, Utah | 178 | |
| 16. | North side of Dome Canyon, House Range, Utah | 182 |
| 17. | West face of House Range beneath Tatow Knob, Utah | 184 |
| 18. | Lower Cambrian quartzites, Inyo County, California | 186 |
| 19. | Eastern side of Sherbrooke Ridge, British Columbia | 207 |
| 20. | Fig. 1. North Ridge of Castle Mountain, Alberta | 209 |
| Fig. 2. Southeast front of Castle Mountain, Alberta | 209 | |
| 21. | Mount Stephen, British Columbia, from the north | 210 |
| 22. | Ridges southeast and west of Lake Louise, Alberta | 216 |
| 23. | Cambrian Trilobites (Nevadia) | 380 |
| 24. | "" (Elliptocephala, Olenellus?, Pæpdeumias) | 382 |
| 25. | Cambrian Trilobites (Elliptocephala, Pædeumias) | 384 |
| 26. | "" (Mesonacis) | 386 |
| 27. | "" (Callavia, Holmia) | 388 |
| 28. | "" (Callavia) | 390 |
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