EXPLANATION OF PLATES 26". 26^'. 37 



in the same straight line. The footsteps d. e. f. form 

 part of another track of the same kind. Some of 

 the large toes of the Chirotherium, and also of the 

 smaller species, have left distinct impressions of 

 nails : g. h. i. k, 1. m, n. o. p. q, form the track of 

 an animal of another species, probably a Tortoise, 

 <5rossing the same slab, in a different direction. 



The irregular cylindrical concretions that inter- 

 sect each other on the surface of this slab, appear 

 to have been formed in cracks, caused by the con- 

 traction of a thin bed of green marl, interposed 

 between two deposits of Sandstone. See note, V. I^ 

 p. 266. 

 Fig. 2. One of the impressions of the hind feet of Chiro- 

 therium, on the slab Fig. 1 ; half nat. size. (Sickler.) 

 Fig. 3. One of the footsteps in the track of the smaller 



animal, upon this slab ; nat. size. (Sickler.) 

 M. Link has made out the footsteps of four species of 

 animals in the Hildburghausen sandstone ; and it has been 

 conjectured that some of these have been derived from 

 gigantic Batrachians. 



Plate 26". V. I. p. 265. 



Impression of the hind foot of Chirotherium, selected 

 from a well preserved Track upon a slab of sandstone from 

 Hildburghausen, in the British Museum. (Original.) 



Plate 26"'. V. I. p. 265. 



Footsteps of a small web-footed animal, probably croco- 

 dilean, drawn from a Cast of impressions on Sandstone, 

 found near Hildburghausen. (Original.) 



The Sandstones in which all these fossil footsteps have 

 been discovered in Germany and Scotland, appear to be 

 referrible to the same division of the secondary strata, 



