40 ON THE SPECIES OF FAVOSITES OF THE 



The presence or absence of rudimentary septa. For convenience of 

 reference, the more important species of Favosites may be arranged 

 as in the following table, it being remembered that some of the species 

 here enumerated are perhaps not valid, and the characters derived 

 from the number of rows of mural pores are not constant, even in 

 the limits of the same species : 



A. Massive Species. 



«. Tabulae coniplete. One row of mural pores, placed on the faces of the 

 corallites. 



1. Favosites hasaltica, Gold. 



2. Favosites turbinata, Billings. 



b. Tabulfe complete. Two rows of mural pores, placed on the faces of the 



corallites. , 



3. Favosites Gothlandica, Lam. 



4. Favosites Niagarensis, Hall. 



c. Tabulae complete. Three rows of mural pores, placed on the faces of the 



corallites. 



5. Favosites multipora, Lonsd. 



6. Favosites Troosti, Edw. (fe H. 



d. Tabulfe complete. Mural pores situated in the angles formed by the 



prismatic walls of the corallites. 



v. Favosites alveolaris, Gold. 



8. Favosites aspera, Gold. 



e. Tabulae more or less incomplete. Mural pores in one, or more commonly 



in two rows. 



9. Favosites hemispherica, Yandell & Shumard. 



10. Favosites Forbesi, Edw. & H. 



B. Ramose Species. 



a. With one row of mural pores, on the faces of the corallites. 



11. Favosites polymorpha, Gold. 



12. Favosites cervicornis, De Blainville. 



13. Favosites reticulata, De Blainville. 



b. With one row of pores, placed in the angles formed by the prismatic 



angles of the corallites. 



14. Favosites fibrosa, Gold. 



Of the above-mentioned species, the ones which have as yet been 

 recognized as occurring in the Devonian Rocks of Canada are Favo- 

 sites Gothlandica, Lam., F. hasaltica. Gold., F. hemispherica, Yandell 

 & Shumard, F. Forhesi, Edw. & H., i^. turbiiiata, Billings, F. cervi- 

 iCornis, De Blainville, and F. polymorpha, Gold. . 



