LIST OF ILLUSTRATIONS 



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Sections of Foraminifera . 



Dimorphism of Nummulites Icevigatus .... 



Foraminifera. Biloculina. Miliolina. Spiroloculina. Textu 

 laria. Lagena. Cristellaria. Nodosaria. Globigerina 

 Rotalia ....... 



Nummulites ....... 



Heliosphcera ....... 



Radiolaria. Lithocampe. Trochodiscus. Podocyrtis 



Section of Leucosolenia ..... 



Section of Grantia . 



Sponge spicules 



Protospongia fenestrate,, Menevian Beds . 



Siplwnia tulipa, Upper Greensand . 



Obelia ........ 



Monograptus, Diplograptus .... 



Tetragraptus headi, Arenig Kocks . 



Eetiolites geinitzi, Silurian .... 



Diplograptus with reproductive sacs 



Didymograptus v-fractus. Early part of polypary 



Early stages of Monograptus and Diplograptus 



Diplograptus pristis ...... 



Phyllograptus , Arenig Rocks .... 



Stromatoporoidea. Sections of Actinostroma . 



Diagram of a simple coral .... 



Diagrammatic section of a Zoantharian polyp 



Diagrammatic section of a simple coral . 



Montlivaltia trochoides, Inferior Oolite . 



Budding of Dendrophyllia, Cyathophyllum, Gladochonus 



Section of Dissepiment of Galaxea . 



Section of septum and theca of Galaxea . 



Development of septa in Zaphrentis 



Section of Cyathophyllum murchisoni, Carboniferous 



Lithostrotion basaltiforme, Carboniferous 



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