50 Two New Species of Fossil F'ootmarks. 
Genus Bronrozoum, (fgort7s, a giant, and Zwov, an animal.) 
Foot tridactylous, pachydactylous, the toes making strong tu- 
bercle-like phalangeal impressions; having claws, which in the 
lateral toes proceed from the outer side, and in the middle toe 
from the inner side ; inner toe shortest: all of them directed for- 
ward. ‘Tubercular swellings or phalanges of the inner toe, two; 
of the middle toe, three; of the outer toe, four. The distal ex- 
tremity of the tarso-metatarsal bone double-headed ; yet rarely 
reaching the ground: the cushion beneath it, making an im- 
pression, which slopes upward posteriorly. Animals bipedal, 
gregarious. 
Five species known: one of them of great size,—with a foot 
eighteen inches long. 
Affinities —The number and position of the toes, and of the 
phalanges of the several toes, as well as the manner in which the 
steps succeeded one another, ally the animals to birds. The 
deficiency of the hind toe, and the great length of most of the 
steps, ally them to Gralle. The great thickness of the toes, and 
the great size of the feet in some instances, suggest a relation to 
the Struthionide. 
Fig. 2. 
Brontozoum parallelum. (Fig. 2, a and b.) 
Divarication of the lateral toes, 15° to 20°; do. of the é 
and middle toe, 5° to 6°; do. of the outer and middle toe, 
