PLATE XVIII. 



Chonophyllum nymphale, Billings (page 187). 



Figure 1. Side view of the type specimen from Anse a la Vieille, Baie des Chaleurs, 



Que.; three- fourths the natural size. 

 Figure la. Longitudinal section of the same. On account of their smallness the vesicles 



are shown only in places. 



Cystiphyllum maritimum, Billings (page 191). 



Figure 2. Side view of the type specimen from Anse a la Vieille, Baie des Chaleurs, 



Que. 

 Figure 2a. Longitudinal section of the same. As in figure la the vesicular structure is 



here also only partially represented. 



Cystiphyllum aggregatum, Billings (page 193). 



Figure 3. Side view of a few corallites of a specimen from lot 6, concession 13, townr 

 ship of Walpole, Haldimand county, Out. 



Cayug^ea Whiteavesiana (page 196). 



Figure 4. The type specimen from the north half of concession 1, lot 53, Cayuga town- 

 ship, county of Haldimand, Ont. ; one-half the natural size. 

 Figure 4a. Longitudinal section of the same ; three-fourths the natural size. 

 Figure 46. Transverse section of the same ; similarly reduced. 



