PLATE VI*. 



COLUMNARIA ALVEOLATA, GoldfuSS (page 98). 



Figure 1. Transverse section of corallites of a specimen from Stewart's quarry (near 

 Sand Point), lot 18, concession 11, township of McNab, Renfrew 

 county, Ont. ; enlarged two and a half times. 



Figure la. Longitudinal section from the same specimen ; enlarged two and a half times. 



Column aria Halli, Nicholson (page 100). 



Figure 2. Transverse section of a specimen, from Stewart's quarry, found associated 



with C. aJveolata ; enlarged two and a half times. 

 Figure 2a. Longitudinal section from the same specimen ; similarly enlarged. 



Columnaria rugosa, Billings (page 101). 



Figure 3. Side view of part of the type specimen from " Little Discharge," Lake St 



John, Que. 

 Figure 3a. Longitudinal section of one of the corallites. 

 ligure 3b. Transverse section of the same. 



Columnaria calicina, Nicholson (page 102). 



Figure 4. Transverse section of a specimen from Streetsville, Ont. ; enlarged two and 

 a half times. 



Petraia profunda, Conrad (page 105). 



Figure 5. Side view of a specimen from La Petite Chaudiere, Ottawa, Ont. 

 Figure 5a. Longitudinal section of the same specimen. 

 Figure 5b. The calyx of the same, as seen from above. 



Petraia pygm.ea, Billings (page 106). 



Figure 6. Side view of a specimen from Heath Point lighthouse, Anticosti. 



Figure 6a. Longitudinal section of the same specimen. 



Figure 66. Transverse section of the same, above the bottom of the calyx. 



Streptelasma corniculum, Hall (page 108). 



Figure 7. Side view of a specimen collected by Mr. E. Billings, at Ottawa, Ont. 



Figure la. Longitudinal section of the same specimen. 



Figure lb. Transverse section of another specimen from the same locality. 



Streptelasma selectum, Billings (page 113). 



Figure 8. Side view of a specimen (one of the types of S. pulchella) from Gamache Bay 



Anticosti. 

 Figure 8a. Longitudinal section of the same. 



Streptelasma latusculum, Billings (page 114). 



Figure 9. Side view of type specimen from the " Jumpers," Anticosti. The drawings 

 reproduced with the original description were made from this spec- 

 imen. 



Figure 9a. Longitudinal section of the same. 



* All the figures are of natural size, unless otherwise stated. 



