LIST OF ILLUSTRATIONS IN THE TEXT. 



FIG. 



74. 



75. 



76. 



77. 



78. 



79. 



80. 



81. 



82. 



83. 



84. 



85. 



86. 



87. 



88. 



89. 



90. 



91. 



92. 



93. 



94. 



95. 



96. 



97. 



98. 



99. 

 100. 

 101. 

 102. 

 103. 

 104. 

 105. 

 106. 

 107. 

 108. 

 109. 

 110. 

 111. 

 112. 

 113. 

 114. 

 115. 

 116. 

 117. 

 118. 

 119. 

 120. 

 121. 



Amphigraptus divergens var. radiatus 



— distans 

 Nemagraptus gracilis ... 



— — var. surcularis 

 — remotus 



— — — nitidulus ... 



— S P 



— explanatus... 



■ — — var. pertenuis . . . 

 Dicellograptus sp. 



— complanatus 



— — var. ornatus 



— auceps 



— cfr. divaricatus 



— divaricatus var. rigidus ... 



— — — salopieusis... 



— intortus 



— patulosus ... 



— pumilus 



— angulatus ... 



— Forchammeri 



— — var. flexuosus ... 



— sextans 



■ — — var. exilis 



Morrisi 



Moffateusis 



— elegans 



— — var. rigens 



— caduceus ... 

 Dicranograptus Clingani 



— tardiusculus 



— brevicaulis 



— rectus 



— celticus 



— Nicholsoni . . . 



— cyathif ormis 



— ramosus 



— — var. spinifer ... 



— ziczac 



— ■ furcatus var. minimus 



Climacograptus Scharenbergi 



— Wilsoni 



— scalaris 



— — var. nonnalis ... 



— — var. miserabilis 



— rectangularis 



PAGE 



123 



124 



127 



129 



131 



131 



132 



133 



134 



135 



139 



141 



142 



143 



145 



145 



146 



148 



149 



150 



151 



152 



154 



155 



156 



157 



160 



161 



161 



166 



167 



168 



170 



171 



172 



173 



174 



175 



176 



178 



179 



179 



182 



183 



184 



186 



187 



188 



FIG. PAGE 



122. Climacograptus medius ... ... 189 



123. - Tornquisti 191 



124. — minimus ... ... ... ... 192 



125. - brevis 193 



1'26. — bicornis ... ... ... ... 194 



127. — supernus 197 



128. — Wilsoni 198 



129. var. tubularis 199 



130. — antiquus 200 



131. — — var. bursifer ... ... ... 201 



132. lineatus 201 



133. — caudatus 202 



134. - tubiliferus 203 



135. — latus 205 



138. — styloideus 206 



139. — Scharenbergi 207 



140. — Hughesi 209 



141. — extremus ... ... ... ... 210 



142. — minutus 211 



143. — innotatus ... ... ... ... 212 



144. — tuberculatus ... ... ... 213 



145. Orthograptus quadrimucronatus ... 223 



146. — — var. spinigerus ... ... 225 



147. — Pageanus ... ... ... ... 225 



148. — — var. micracanthus ... ... 226 



149. — Whitfieldi 227 



150. — insectiformis ... ... ... 228 



151. — vesiculosus ... ... ... 229 



152. — bellulus 232 



153. — mutabilis 233 



154. — truncatus ... ... ... ... 234 



155. — — var. abbreviatus ... ... 235 



156. — — — intermedius ... ... 236 



157. socialis 237 



158. - cyperoides 238 



159. — calcaratus . .. ... ... ... 240 



160. — — var. vulgatus ... ... ... 241 



161. — — — acutus ... ... ... 242 



162. basilicus 243 



163. — — — tenuicornis ... ... 243 



164. — — — priscus ... ... ... 244 



165. Diplograptus (Orthograptus) priscus 245 



166. Orthograptus rugosus var. apiculatus 246 



167. Glyptograptus tamariscus ... ... 248 



168. — — var. incertus ... ... ... 249 



169. — serratus 250 



170. var. barbatus 250 



171. — teretiusculus ... ... ... 250 



