94 



THE GENUS MONTICULIPORA. 



(Foss. Cor. of Mich., p. 29) that the coral described by Mr 

 Bilhngs from the Devonian of Canada, under the name of 

 Fistulipora Canadensis (fig. 17), is provided with perforate 



c 



I r 





)kO 



I \''C 



Fig. 17. — A, Tangential section of a completely silicified speciiv.en of Fistulipora Canadensis, 

 Bill., from the .Corniferous Limestone of Ontario, enlarged seven times; E, Vertical 

 section of the same specimen, similarly enlarged ; c, Tangential section of a calcareous 

 specimen oi Fistulipora Canadensis, Bill., from the Hamilton Group of Ontario, enlarged 

 seven times; D, Vertical section of tlie same specimen, showing "mural pores," simi- 

 larly enlarged. 



walls, and is therefore a genuine Favositoid type. We thus 

 have a coral which precisely resembles the normal forms of 

 Fistnlipora in appearance, but which exhibits mural pores ; and 

 it becomes, therefore, a matter for future research whether or 

 not these structures occur in any other species now referred to 

 Fistulipora. Dr Steinmann (N. Jahrb. ftir Min., &c., Jahrg., 

 1880, p. 438) has recently stated that the coral which Billings 

 described under the name of Fistnlipora Canadensis has a 

 minute structure (especially as regards the wall) quite different 

 to that exhibited by Callopora, Hall, and has given a figure of 

 a cross-section of what he believes to be Fistnlipora Cana- 

 densis, Bill., in support of his opinion. This observer, also, 

 states in the same place that his investigations into the struc- 



