TRIASSIC PERIOD. 



429 



(c.) Birds. — Fig. 649, Brontozoum giganteum Hk., reduced to one-sixth natural 

 size. Fig. 649 A represents part of a slab of sandstone figured by Hitch- 



Fig. 649. 



Fig. 649 A. 



r 



i^\ 



M $ ! 



giganteum (X}i)- 



Slab of sandstone, with tracks of 

 Birds and Reptiles ( X ab )• 



cock, one-thirtieth natural size lineally : a, b, c, are three kinds of bird-like 

 tracks; a and c are of the genus Brontozoum Ilk.; a, a, same as 6, but drawn 

 larger to show the articulations of the toes. Figs, d, e, are two kinds of Rep- 

 tilian tracks of the genus Anisopus Hk., d Anisopus Deweyanus Hk. Natural 

 length of a, 4 inches; of b, 8 to 9 inches; of c, 3| inches; of d and e, 1 to 1\ 

 inches. The best localities of tracks of birds and other animals are at Green- 

 field and Turner's Falls, Mass. ; Portland, Conn. 



(d.) Mammals. — Fig. 650, Dromatherium sylvestre Emmons, from North Caro- 

 lina. Owen says of the species that " this Triassic or Liassic Mammal would appear 



Fig. 650. 



Dromatherium sylvestre. 



to find its nearest living analogue in Myrmecobius ; for each ramus of the lower 

 jaw contained ten small molars in a continuous series, one canine and three 

 conical incisors,— the latter being divided by short intervals." 



