X 



LIST OF ILLUSTRATIONS 



FIG. 



74. Horizontal section of shell of Terebratula maxillata 



75. Iphidea labradorica, Lower Cambrian . 



76. Lingula anatina, Recent ..... 



77. Crania anomala, Recent ..... 



78. Productus giganteus, Carboniferous 



79. Chonetes, Devonian ...... 



80. Orthis (Schizophoria) striatula, Devonian 



81. Pentamerns (Conchidium) knighti, Aymesfcry Limestone 



82. Spirifer striatus, Carboniferous 



83. Atrypa reticularis, Wenlock Limestone . 



84. Rhynchonella (Hemithyris) psittacea, Recent. 



85. Rhynchonella (Pugnax) acuminata, Carboniferous 



86. Terebratula (Liotliyris) vitrea, Recent . 



87. Terebratulina caput-serpentis, Recent 



88. Stringocephalus burtini, Devonian . 



89. Structure of Polyzoa ..... 



90. A, Smittia landsborovi. B, Tubulipora fimbria, Recent 



91. My a arenaria, Recent ...... 



92. Meretrix (Callista) chione, Recent .... 



93. Nucula, Trigonia, Spondylus, Lucina, Lutraria 



94. Vertical section of shell of Unio .... 



95. Section of prismatic layer of Pinna, Recent . 



96. 97. Sections of Hippurites cornu-vaccinum, Cretaceous 



98. Section of Tritonium corrugatum, Recent 



99. Bellerophon, Carboniferous . 



100. Nerinea trachea, Great Oolite 



101. Hyolithes, Cambrian 



102. Section of Sepia officinalis, Recent 



103. Section of shell of Nautilus . 



104. Central part of shell of Nautilus 



105. Section of Actinoceras 



106. Aperture of Gomphoceras bohemicum, Silurian 



107. Sutures of Parkinsonia, Jurassic, and Ceratitcs, Trias 



108. Central part of shell of an Ammonite 



109. Aptychus of an Ammonite, Oxfordian 



110. Glyphioceras spharicum, Carboniferous 



111. Ceratites nodosus, Muschelkalk 



112. Phylloceras heterophyllum, Lias 



113. Suture of Phylloceras . 



114. Lytoceras fimbriatum, Lias 



115. Macroscaphites ivani, Lower Cretaceous 



116. jEgoceras capricornus, Lias . 



117. Harpoceras serpentinum, Lias 



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