TABLE OF CONTENTS. 



Introductory Remarks 



I. Historical Introduction 



II. The General Structure of the Skeleton 



1. General Form and Mode of Growth 



2. Chemical Composition and Mode of Preservation 



3. The Minute Structure of the Skeleton 



a. The Skeletal Tissue . 



b. The Radial Pillars and Coucentric Laminae 



c. Variations in the Structure of these 



d. The Interlaminar Spaces 



e. The Zooidal Tubes . 



f. The Astrorhizae 

 g.. The Astrorhizal Tabulae 

 h. The Axial Tubes 

 i. The Epitheca 

 j. The Surface 



h. The Reproductive Organs 



III. Systematic Position and Affinities of the Stromatoporoids 



IV. Sketch-Classification .... 



V. Families and Genera of the Stromatoporoids 



1. Actinostromidce ..... 



2. Labechiidce ..... 



3. Stromatoporidce . 



4. Idiostromidce . 



page 

 i 



27 

 27 

 29 

 32 

 35 

 39 

 43 

 47 

 49 

 53 

 56 

 57 

 58 

 59 

 62 



64 



72 



75 

 75 

 80 

 90 

 98 



VI. The Nature of " Caunopora " 



110 



