PLATE I. 



Favosites Gothlandica, Lamarck (page 3). 



Figure 1, Side view of a corallite from a specimen from l'Anse a la Vieille, Baie des 

 Chaleurs, showing the mural pores, tabulae and septal spines ; for 

 greater clearness the tabulae are omitted from the central part 

 and the septal spines from the upper part of the figure. Five 

 times the natural size. 



Favosites aspera, d'Orbigny (page 4). 



Figure 2. Side view of a corallite from a specimen from Stonewall, Manitoba ; as in 

 figure 1 the septal spines and tabulae are not shown together. 

 Magnified five times. 



Favosites basaltica, Goldfuss (page 8). 



Figure 3.' Representation of the arrangement of the tabulae and squamulae in the 

 interior of a corallite of a specimen from the Corniferous lime- 

 stone of Ontario ; the tabulae alone are shown in the upper part 

 of the figure. Enlarged five times. 



Figure 3a. A few corallites from the same specimen as seen from above, showing com- 

 plete tabulae in some of the corallites. Enlarged five times. 



CffiNiTES Selwynii, Nicholson (page 28). 



Figure 4. Portion of the upper surface of a specimen from Hagarsville, Ontario. 



Five times the natural size. 

 Figure 4a. Vertical section of the same specimen. Enlarged five times. 



Cladopora cryptodens, Billings (page 31). 



Figure 5. Side view of a few calyces of a specimen from the Corniferous limestone of 

 Ontario. Enlarged five times. 



Figure 5a. Corallites from the same specimen, as seen in transverse section imme- 

 diately below the calyces and showing the three septal ridges. 

 Five times the natural size. 



Calaposcia Canadensis, Billings (page 43). 



Figure 6. Longitudinal section of portion of a specimen from Lower Fort Garry, 

 Manitoba ; three corallites are here represented with a space 

 crossed by diaphragms separating two of them. Enlarged two 

 and one half times. 



Figure 6a. Transverse section from the same specimen, similarly enlarged. 



Figure 7. A rather diagrammatic representation of the interior of a corallite of a 

 specimen from Lower Fort Garry, Manitoba ; the tabulae are 

 purposely left out. Five times the natural size. 



Fletcheria incerta, Billings (page 48). 



Figure 8. Transverse section of portion of a specimen with cylindrical corallites from 

 St. Charles Island, Mingan Islands, Gulf of St. Lawrence. En- 

 larged five times. 



Figure 8a. Longitudinal section of a few corallites from the above specimen, similarly 

 enlarged. 



Figure 9. Transverse section of a portion of a specimen, with polygonal corallites, 

 from the same locality. Five times the natural size. 



