Two New Species of Fossil Footmarks. Ag 
made by the right and Fig. 1. Reduced 18 diameters. 
left feet of the animal: ) 
and hence I was forced, 
contrary to my first im- 
attempting to trace its 
analogies to living ani- 
mals, however, I have 
r 
animal of the thirty or 
forty species that impres- 
structure, characters now 
this suggestion can be 
judged of better after de- 
Scribing the fcotmar 
under consideration. 
n the same slab with 
the large tracks, are those 
of two other species of 
thick toed bipeds ; one of 
which is the Brontozo- 
um Sillimanium, (Orni- 
thoidichnites Sillimani 
Species known to me. 
Szconp Srnies, Vol. IV, No. 10.—July, 1847. 7 
