PLATE 34 A (bis). 



Ftg. 4. 515. 1. Favosites niagarensis. (Pag. 125.) 



4 a. A fi-figment from the limestone at Goat island, showing the ends of the cells which arc open. 

 4 6. A portion enlarged, showing the transverse septa and pores in the walls of the cells. 

 4 c. A small spherical form, having the cells open, and the walls replaced by siliceous matter. 

 4 d. A small portion enlarged, looking into the cells and showing the perforated walls. 

 4 e. A worn specimen from the lower part of the limestone at Lockport, The cells are open, hut there are 



no pores visible. 

 4 /. A section of a small mass of apparently the same species, showing the septa bent downwards. 

 ■i g. A longitudinal section of another specimen, in which the septa appear at irregular intervals, some of 



them at great distances, probably from a part of the original number having been obliterated; and 



others in close proximity, showing that this feature can not be relied upon to characterize specific 



distinctions. 

 4 h. Transverse section, showing the ends of the cells and the separation of the walls, forming distinct and 



separate tubes, 



4 i. A larger and better preserved specimen of this species. 



Fig, 5. 516. 2. Favosites favosa? (Pag. 126.) 



o a. A longitudinal section of a small hemispherical mass. 



5 b. Section of another specimen, where the septa are more distant and irregular. 



6 c. The solid columns of the same species. 

 5 d. Transverse .section of the cells. 



5 c. An impression left by the exterior surface of one of these masses. 



5 /. A larger individual of the same species, having the septa more uniformly disposed. 



5 g. A porti<jn of the last enlarged. 



