Page:Walcott Cambrian Geology and Paleontology II.djvu/12

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viii
ILLUSTRATIONS
23. Middle Cambrian Annulata (Canadia and Aysheaia) 144
24. Middle Cambrian Crustaceans (Neolenus, Ptychoparia, Mollisonia, and Tontoia) 208
25. Middle Cambrian Crustaceans (Marrella) 210
26. """ (Marrella) 212
27. Middle Cambrian Crustaceans (Burgessia, Waptia, and Opabinia) 214
28. Middle Cambrian Crustaceans (Opabinia, Nathorstia, and Naraoia) 216
29. Middle Cambrian Crustaceans. (Molaria, Habelia, and Yohoia) 218
30. Middle Cambrian Crustaceans (Bidentia, Emeraldella, and Burgessia) 220
31. Middle Cambrian Crustaceans (Hymenocaris and Leanchoilia) 222
32. Middle Cambrian Crustaceans (Hymenocaris, Fieldia, and Hurdia) 224
33. Middle Cambrian Crustaceans (Carnarvonia and Tuzoia) 226
34. """ (Hurdia, Odaraia, and Anomalocaris) 228
35. Brachiopods and Trilobites (Lingulella, Obolus, and Ceratopyge) 236
36. Trilobites (Olenopsis) 248
37. Cryptozoon proliferum Hall 280
38. Trail of Annelid (Climactichnites) 282
39. """ (Climactichnites) 284
40. """ (Climactichnites) 286
41. Potsdam-Hoyt Fauna (Lingulella, Triblidium, Pelagiella, and Matherella) 288
42. Potsdam-Hoyt Fauna (Matthevia) 290
43. """ (Palæacmæa, Hyolithellus, Hyolithes, Lonchocephalus, Agraulos, Ptychaspis, and Ptychoparia) 292
44. Potsdam-Hoyt Fauna (Dikelocephalus, Conokephalina, Pagodia, and Ptychoparia) 294
45. Legs of Trilobites (Neolenus serratus) 296
46. Tracks of Trilobites (Protichnites) 298
47. """ (Protichnites) 300
48. """ (Protichnites) 302
49. """ (Protichnites) 304