Fig. 4. 
4 a. 
4 b. 
4 c. 
4 d. 
4 e. 
4/- 
4 g. 
4 h. 
Fig. 5. 
5 a. 
hb. 
5e. 
hd. 
h e. 
«/• 
hg. 
PLATE 34 A (bis). 
515. 1. FAVOSITES NIAGARENSIS. (Pag. 125.) 
A fragment from the limestone at Goat island, showing the ends of the cells which are open. 
A portion enlarged, showing the transverse septa and pores in the walls of the cells. 
A small spherical form, having the cells open, and the walls replaced by siliceous matter. 
A small portion enlarged, looking into the cells and showing the perforated walls. 
A worn specimen from the lower part of the limestone at Lockport. The cells are open, but there are 
no pores visible. 
A section of a small mass of apparently the same species, showing the septa bent downwards. 
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. 
Transverse section, showing the ends of the cells and the separation of the walls, forming distinct and 
separate tubes. 
A larger and better preserved specimen of this species. 
516. 2. Favosites favosa? (Pag- 126.) 
A longitudinal section of a small hemispherical mass. 
Section of another specimen, where the septa are more distant and irregular. 
The solid columns of the same species. 
Transverse section of the cells. 
An impression left by the exterior surface of one of these masses. 
A larger individual of the same species, having the septa more uniformly disposed. 
A portion of the last enlarged. 
