ILLUSTRATIONS 



PLATES 



TO FACE PAGE 



1. Map showing distribution of pre-Cambrian Rocks 4-5 



2. Middle Cambrian Merostomata (Sidneyia) 30 



3. " " " (Sidneyia) 32 



4. " " " (Sidneyia) 34 



5. " " " (Sidneyia and Amiella) . . 36 



6. " " Trilobita and Merostomata (Neolenus 

 afid Sidneyia) 38 



7. Cambrian and pre-Cambrian Merostomata (Sidneyia and 



Beltina) 40 



8. Middle Cambrian Medusa and Holothurian (Peytoia and 



Eldonia) 5^ 



9. Middle Cambrian Holothurians (Eldonia) 60 



10. " ' " " (Eldonia) 62 



11. " " " (Eldonia) 64 



12. " " " (Eldonia) 66 



13. " " " (Laggania, Mackensia, and 

 Lonisella) 68 



14. Cambrian Faunas of China (Micromitra (Paterina), Lin- 



gulella, Acrotreta, Orthotheca, Alhertella, Stephanocare, 

 Ptychoparia, Ptychoparia (Emmrichella) , Crepicephalus, 

 Pterocephalus, and Inouyia) 102 



15. Cambrian Faunas of China (Agraulos, Lisania, Chuangia, 



Levisia, Anomocare, and Anomocarella) 104 



16. Cambrian Faunas of China (Coosia, Asaphiscus, Bathyuris- 



cus, and Solenopleura) 106 



17. Cambrian Faunas of China (Anomocare, Anomocarella, and 



Levisia) 108 



18. Middle Cambrian Annulata (Miskoia) 134 



19. " " " (Ottoia, Hyolithes, and Sel- 

 kirkia) 1 36 



20. Middle Cambrian Annulata (Pikaia and Oesia) 138 



21. " " " (Wiwaxia, BanfUa, and Pol- 

 lingeria 140 



22. Middle Cambrian Annulata (Planolites, Worthenella, Amis- 



kivia, and Ottoia) 142 



(vii) 



