LIST OF ILLUSTRATIONS xi 



FIG. PAGE 



67. Ciipressocrinus - . 245 



68. Amphoracrinus atlas - - 247 



69. Marsupites testudinarius - 249 



70. Crinoid columnals - 251 



71. Crinoidea - - 252 



72. Echinosphcera aiirantium - 256 



73. Cystoidea - - 257 



74. Peniremites pyrifonnis - - 259 



75. Hemicidaris intermedia - - 262 



76. Conulus albogalerus - - 265 



77. Micrasier cor-anguinum - 267 



78. Regular Echinoids - 272 



79. Irregular Echinoids - - 274 



80. Collyrites ringens - 275 



81. Echinocorys scutatus - - 277 



82. Holaster subglobosus - - 278 



83. Didymograptus mtirchisoni - - 282 



84. Didymograptus minutus - 283 



85. Evolution of the Dichograptida? - 285 



86. Climacogr optics' u'ilsoni - 289 



87. Monograptus priodon - - 290 



88. Various Graptolites - - 292 



89. Zaphrentis konincki - - 299 



90. Development of Major Septa in a Rugose Coral - 300 



91. Septal Development in Rugosa - 301 



92. Lithostrotion irregulare - 305 



93. Parasmilia centralis - 307 



94. Fossil Corals - - 312 



95. Porifera - - 317 



96. Dimorphism in a Foraminifer - - 321 



97. Nummulites - - 324 



98. Orthophragmina umbilicata - - 325 



99. Lepidocyclina tournoueri - 326 

 100. Fossil Plants - - 336 



