PLATE V. 

 Lyellia apfinis, Billings (page 84). 



Figure 1. Transverse section of part of a specimen from three miles west of Jupiter 



River, Anticosti. Magnified five times. 

 Figxire la. Longitudinal section of the same. Enlarged five times. 



Lykllia Americana, Milne- Edwards and Haime (page 85). 



Figure 2. Corallites, as seen in transverse section, in a specimen from Grand Mani- 



toulin Island, Lake Huron. Five times the natural size. 

 Figure 2a. Longitudinal section of the same. Five times the natural size. 



Lyellia exigua, Billings (page 86). 



Figure 3. Horizontal section showing the disposition of the corallites in a specimen 



from Gamache Bay, Anticosti. Enlarged five times. 

 Figure 3a. Longitudinal section from the same specimen, also enlarged five times. 



Lyellia superba, Billings (page 87). 



Figure 4. Type specimen from Cabot's Head, Georgian Bay. Onehalf the natural size. 

 Figure 5. Transverse section from a specimen from Owen Sound, Ontario. Five 



times the natural size. 

 Figure 5a. Longitudinal section of the same. Enlarged five times. 



Lyopora Goldfussi, BiUiugs (page 88). 



Figure 6. Transverse section from a specimen from Snake Island, Lake St. John, 

 Que., showing polygonal corallites. Five times the natural size. 



Figure 6a. Longitudinal section of the same, also magnified five times. 



Figure 7. Transverse section from a specimen from the some locality, showing 

 circular corallites. Enlarged five times. 



Protarea vetusta, Hall (page 90). 



Figure 8. Transverse section, a little below the surface, in a specimen from Ottawa, 



Ontario. Enlarged five times. 

 Figure 8a. Longitudinal section of the same showing a calyx with the pseudocolumella 



occupying the centre of the corallite. Enlarged five times. 



StylaEjEA parva, Billings (page 91). 



Figure 9. Part of the upper surface of a specimen from the Mingan Islands, Gulf of 



St. Lawrence. Enlarged five times. 

 Figure 9a. Transverse section from the same specimen. Magnified five times. 

 Figure 96. Longitudinal section from the same, likewise enlarged five times. 



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