28 
The Srconp Genus of Struthiones is called Athyo- 
pus, from adua, a gull, and zo, a foot, — gull-footed. 
This genus is smaller than the Brontozoum Gigan- 
teum; and we have two species, viz. the Ai’rHyopus 
LyELiianus, which is the larger, and two specimens 
of AirHyopus Minor. All of these are distinguished 
from the preceding genus by the winged foot, and in 
the Lyellianus by the shallowness of the impression. 
The Ethyopus Minor is not always distinguished by 
the superficiality of its impression. This is sometimes 
deep. Therefore this character may not be considered 
a distinctive one, or the AXthyopus Minor might be 
referred to another genus. Of the two specimens of 
this latter species, the first is in depression, tridacty- 
lous. The depressions are deep with rain-drops, 
marks of quadrupeds and zoophytes over the whole 
surface. The ornithichnic impressions are two in 
number; one superficial, the other very deep. The 
reversed surface of this slab contains one tridactylous 
impression in relief. The second specimen has three 
depressions; two of which are superficial, and the 
third is quite deep, displaying, by a depressed surface, 
the webbed character of the foot. 
