PLATE IT. 

 Nyctopora Billingsii, Nicholson (page 49). 



Figure 1. Transverse section, enlarged five times, of corallites of a specimen from 



Peterborough, Ontario. 

 Figure la. Longitudinal section of corallites of the same.. Magnified five times. 



Syringopora Dalmanii, Billing3 (page 51). 

 Figure 2 Side view of part of acorallum from Lake Temiscaming, Que. Natural size. 



Syringopora retiformis, Billings (page 52). 



Figure 3. Side view of part of a specimen from the township of Derby, county Grey, 

 Ontario, Natural size. 



Syringopora perelegans, Billings (page 56). 



Figure 4. View of the under side of a part of the leaf-like basal expansion ,of a 

 specimen from the Corniferous limestone of Ontario. Natural size. 



Tetradium fibratum, Safibrd (page 93). 



Figure 5. Transverse section of a few corallites that show secondary septa ; from 

 Pointe Claire, Island of Montreal. Magnified thirteen times. 



Heliolites interstincta, L. (page 79). 



Figure 6. Transverse section of corallites in a specimen from west of l'Anse a la Barbe, 



Baie des Chaleurs. Five times the natural size. 

 Figure 6a. Longitudinal section of the same, similarly magnified. 



Heliolites subtubulata, McCoy (page 80). 



Figure 7. Transverse section from a specimen from l'Anse a la Vieille, Baie des 



Chaleurs. Enlarged five times. 

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



Plasmopora follis, Milne-Edwards and Haime (page 82). 



Figure 8. Transverse section of a few corallites of a specimen from one mile east of 

 the mouth of the Little Cascapedia River, Baie des Chaleurs. 

 Magnified five times. 



Figure 8a. Longitudinal section of the same also magnified five times. 



Plasmopora petaliformis, Lonsdale (page 83). 



Figure 9. Transverse section of corallites of a specimen from two miles west of 



Chicotte River, Anticosti. Five times enlarged. 

 Figure 9a. Longitudinal section of the same. Five times the natural size. 



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