52 ICHNOGRAPHS OF THE 



posterior foot is tridactylous, the middle toe greatly predominating. There are 

 five radiating toes for the anterior foot. In the usual leaping movements of 

 the kangaroo, the posterior feet only are used ; but in a state of rest, the anterior 

 feet touch the earth, as they also do in a kind of hopping movement peculiar 

 to the creature, when undisturbed, or when seeking its food. Its tail also rests 

 upon the earth, giving support when sitting, and assisting the muscular action 

 of the legs when making its powerful leaps. 



Under all the relations of the footprints to the pedal systems of the kangaroo, 

 the presumption is very strong that the animals making them rank at the 

 bottom of the mammalian class of animals. 



To the above description of Dr. Deane may be added, for readier comparison, that 

 the original specimen of Plate 31, which he states to be fifteen times greater than the 

 photograph, shows the impressions of the footmarks to be about four times longer than 

 the representations of them in the Plate. They are, indeed, of about double the magni- 

 tude of those given, of natural size, in Plate 32, and which were lithographed from a 

 fine specimen in the possession of T. Leonard, Esq., of Greenfield. Dr. Hitchcock con- 

 siders the tracks to be those of two species, and has described them respectively, under 

 the names of Anomaepus major and Anomaepus minor. 



PLATES XXXIII. AND XXXIV. 



The footprints delineated upon Plates 33 and 34 are quadrupedal, and indi- 

 cate an unknown organization of the animals by which they were impressed. 

 They are allied to the footprints upon Plates 31 and 32, the posterior feet being 

 ornithic, and the anterior feet reptilian. They are distinguished from them by 

 the absence of the tarsal impress, and by a difference of mode by which the 

 animal moved, being in Plates 31 and 32 by leaping, and in those now under 

 consideration by walking. In the impressions upon Plates 33 and 34, there is 

 no appreciable difference between the posterior feet and the feet of certain living 

 birds, the osseous divisions of the toes being identical. The anterior feet, although 

 upon the same plan as those upon Plates 31 and 32, have four toes only. In 

 walking, the anterior foot is placed upon the inner aspect of the posterior foot, 

 and it stands directly outward. In Plate 34 it is in advance of the foot; in 

 Plate 33 it is within and behind; and, in tracing a continuous line of the 



