DEVONIAN ROCKS OF WESTERN CANADA. 45 



ceeded m fully satisfying myself that the specimens in question are 

 truly decorticated examples of F. turbinata, Billings, in which there 

 is also but a single row of pores. Examples of this species can be 

 found with the characteristic epitheca in all stages and in all degrees 

 of removal, and when it has entirely disappeared, all the characters 

 of this first section of F. hasaltica, Gold, are assumed, the only dis- 

 tinguishing mark, perhaps, being that the walls of the corallites have 

 the comparatively great thickness which is characteristic of F. turbi- 

 nata. It need only be added in this connection, that unmistakable 

 examples of F. Gothlandica not iincommonly exhibit, as has been 

 often noticed by other observers, the single rows of pores which 

 Goldfuss believed to be charactei'istic of F. basaltica; thouigh I am 

 not aware that any colony of F. Gothlandica has ever been observed 

 in which all the corallites possessed but one row of mural pores. 



"We have now to consider the other group of specimens included 

 by Goldfuss under th^ head of F. basaltica, namely, those in which 

 the corallites are more or less circular or cylindrical in shape, and are 

 veiy imequal in size, whilst they possess other peculiarities as well. 

 These specimens were separated from F. basaltica by Milne Edwards 

 and Haime, under the name of Favosites Forbesi; but they were sub- 

 sequently re-united with the preceding group of forms by Mr. Billings, 

 the name basaltica being retained for the combined groups. My own 

 opinion, as I have already said, is that the colonies with small, nearly 

 uniformly-sized, prismatic, and uniporous corallites (as occurring in 

 the Corniferous Limestone), are referable to decorticated examples of 

 F. turbinata, Billings. I, therefore, am at present disposed to believe 

 that Favosites Forbesi, Edw. and Haime, is a good species, clearly 

 separable from the type-form of F. basaltica, as generally accepted 

 (though including part of F. basaltica of Goldfuss) ; and I shall 

 describe under this name the second group of specimens to which I 

 have drawn attention. 



III. Favosites Forbesi (Edw. & Haime). 

 Corallum forming spheroidal, pyriform, cylindroidal, or depressed 

 hemispheric masses, composed of corallites which are generally circii- 

 lar or cylindrical in shape, and which are usually of very unequal 

 sizes ; mural pores usually in two alternating rows, rarely in a single 

 row ; tabulae mostly rudimentary, and represented by very close-set 

 projecting lamellae, which roughen the inteiior of the corallites j 



