XVI 



LIST OF ILLUSTRATIONS. 



40. Didymograptus divarica- 



tUSy .... 



41. Diplograptus pristis, 



42. Phyllograptus typus, 



43. Zaphrentis Stokesi, . 



44. Strombodes pentagonus, . 



45. Columnaria alveolata, 



46. Group of Cystideans, 



47. Group of Lower Silurian 



Crustaceans, 



48. Ptilodictya falcifonnis, 



49. Ptilodictya Schaffei'i, 



50. Group of Lower Silurian 



Brachiopods, 



51. Group of Lower Silurian 



Brachiopods, 



52. Murchisonia gj-acilis, 



53. Belter ophon argo, . 



54. Maclurea crenulata, 



55. Orthoceras crebriseptum, 



56. Restoration of Orthoceras, 



57. Generalised section of the 



Upper Silurian rocks, 



58. Monograptus priodon, 



59. Halysites catenularia and 



H. agglomerata, . 



60. Group of Upper Silurian 



Star- fishes, 



61. Protasier Sedgwickii, 



62. Group of Upper Silurian 



Crinoids, . 



63. Planolites vulgaris, . 



64. Group of Upper Silurian 



Trilobites, . 



65. Pterygotus Anglicus, 



66. Group of Upper Silurian 



Polyzoa, 



67. Spirifera hysterica, . 



68. Group of Upper Silurian 



Brachiopods, 



69. Group of Upper Silurian 



Brachiopods, 



70. Pentamerus Knightii, 



71. Cardiola interrupta, C. 



jibrosa, and Pterin&a 

 subfalcata, . 



72. Group of Upper Silurian 



Univalves, 



73. Tentaculites ornatiis, 



74. Pteraspis Banksii, . 



75- Onchus tenuistriatus and 

 Thelodus, . 



76. Generalised section of the 



Devonian rocks of 

 North America, 



77. Psilophyton princess, 



Prolotaxites Logani, . 139 

 Strotnatopora tuber culata, 140 

 Cystiphyllum vesicttlostim, 141 

 Zaphrentis cornicula, . 141 

 Heliophyllum exigimm, 141 

 Crepidophyllum Archiaci, 142 

 Pavosites Gothlandica, . 143 

 Favosites hemispkcerica, 143 

 Spirorbis omphalodes and 



S. Arkonensis, . .144 

 Spirorbis laxus and S. 



spinulifera, . .144 



Group of Devonian Tri- 

 lobites, . . 144 

 Wing of Platephemera 



antiqna, . . .145 

 Clathropora intertexta, . 146 

 Ceriopora Hamiltonensis, 146 

 Fenestella magnified, . 146 

 Retepora PhUlipsi, . 146 



Fenestella cribrosa, . 146 



Spirifera sculptilis, . 147 

 Spirifera mucronata, . 147 

 Atrypa reticularis, . 148 

 Strophomena rhomboid' 



alts, . . . .148 

 Platyceras dumosum, . 148 

 Conularia ornata, . 149 



Clymenia Sedgwickii, . 149 

 Group of Fishes from 

 the Devonian rocks of 

 North America, . 151 



Cephalaspis Lyellii, . 152 

 Pterichlhys cornutus, . 153 

 Polypterus and Osteolepis, 154 

 Holoptychius nobilissi- 



mus, . . . .154 

 Generalised section of 

 the Carboniferous rocks 

 of the North of Eng- 

 land, . . . .161 

 Odontopteris Schlotheimii, 164 

 Calamites c anna: for mis, 165 

 Lepidodendron Sternbergii, 167 

 Sigillaria Gra'seri, . 1 68 



Stigmaria ficoides, . 1 69 



Trigonocarpum ovatum, 170 

 Microscopic section of 

 Foraminiferal limestone 

 Carboniferous, North 

 America, . . .172 

 Fusulina cylindrica, . 172 

 Group of Carboniferous 



Corals, . . .174 

 Platycrinus tricontadac- 

 tylus, . . . .175 



