5 6 4 



NEW YORK STATE MUSEUM 



Cyrtograptus murchisoni, 54. 



figure, 460. 



zone, 54, facing p. 9. 

 ulrichi, 52, 55, 57, 130, 137,459-62. 



explanation of plate, 550. 



figures, 460. 

 Cyrtolites, 68. 



Dale, T. N., cited, 13, 62, 63, 64, 142, 144. 

 Dawson, G. M., cited, 29. 

 Dawson, Sir J. William, cited, 140. 

 Dawsonia, 139, 484-85, 488. 



acuminata, 139, 260, 485. 

 figure, 485. 



campanulata, 139, 258, 259, 260, 485. 

 figures, 259. 



monodon, 139. 



rotunda, 139. 



tenuistriata, 139. 



tridens, 139. 

 Dayton, O., 154. 

 Dease river, British Columbia, 9, 25, 48, 



2 50, 370, 382, 446- 

 Deepkill zone, third, 9, 64, 68, 69, 118. 

 Dendrograptidae, 127-28, 145. 

 Dendrograptus, JJ, 127, 130, 145, 147, 173, 

 178, 192, 196, 206, 209, 210, 211, 213, 

 223, facing p. 66. 



sp., 30, 222. 



arundinaceus, 130, 221. 



? bottnicus, 225. 



compactus, 130, 146. 



daw son i, 56, 130. 



diffusus, 130. 



divergens, 130. 



dubius, 130. 



erectus, 130. 



flexuosus, 131. 



fluitans, 131, 145. 



frondosus, 56. 



fruticosus, 131, 145. 



gracilis, [31, T45. 



gracillimus, 131, 215, 219, 220. 



Dendrograptus hallianus, 131, 211. 

 linearis, 269. 

 novellus, 56, 131, 225. 

 praegracilis, 56, 131. 

 ? primordialis, 131. 

 ramosus, 56, 131. 

 rectus, 52, 53, 127, 131, 145. 



explanation of plate, 504. 



figure, 145. 

 cf. serpens, 131, 215. 

 simplex, 56. 131. 215, 218. 

 spinosus, 56, 131. 

 striatus, 131. 

 succulentus, 67, 131. 

 tenuiramosus, 131, 211, 216. 

 unilateralis, 30, 131. 

 Dendroidea, 15, 66, 69, 127-28, 130-32, 



145, 187, 188, 193, 230, 233, 459. 

 Dentalium clays, 65. 

 Desmograptus, 67, 127, 131, 153, 166, 177- 



82, 191, 198, facing p. 66. 

 becraftensis, 58, 127, 131, 179-80. 



explanation of plate, 498. 



figure, 180. 

 cadens, 58, 127, 131, 180-81, 182. 



explanation of plate, 496. 

 cancellatus, 131. 

 devonicus, 131, 180. 

 intricatus, 131. 

 macrodictyum, 131. 

 pergracilis. 52, 55, 127, t 3 t . 179. 

 tenuiramosus, 13, 48. T27. 131, 177-78. 



explanation of plate, 490. 



figures, 178. 

 vandelooi, 58, 127, 131. 181-82. 



explanation of plate, 498. 



figures, 182. 

 Dicellograptus, 17, Cij, yx, 78. 70, 102. T03. 



IO9, TIT. TI2. TT4. TT6, T T7. 128, 



133, 245, 260. 291-93, 315, 316, fac- 

 ing p. 66; distribution in eastern 

 North America, 2T. 



zone. 10 _'(). 285. facing p. o. 



