370 THE CARBONIFEROUS SYSTEM. 



the toes of the present species are much smaller. The footprints are 

 precisely those which we may suppose an animal of the size of 

 Dendrerpeton Acadianum would have made, if, as the bones found 

 render in every way probable, this larger species had a foot similar to 

 that of D. Oweni. I suppose, for this reason, that these footprints are 

 really those of Dendrerpeton Acadianum ; and that this species 

 continued to exist from the time of the Lower Coal measures to the 

 period when those higher beds of the series in which its bones are 

 found at the Joggins were deposited. 



The present species must have lived in the same places with its 

 larger relative ; but may have differed somewhat in its habits. Its 

 longer and sharper teeth may have been better suited for devouring 

 worms, larva?, or soft-skinned fishes, while those of the larger Den- 

 drerpeton were better adapted to deal with the mailed ganoids of the 

 period, or with those smaller reptiles which were more or less protected 

 with bony or horny scales. 



In one of my earliest explorations of the reptile-bearing stumps of 

 the Joggins, I observed on some of the surfaces patches of a shining 

 black substance, which on minute examination proved to be the 

 remains of cuticle, with horny scales and other appendages. The 

 fragments were preserved ; but I found it impossible to determine 

 with certainty to which of the species whose bones occur with them 

 they belonged, or even to ascertain the precise relations of the several 

 fragments to each other. I therefore merely mentioned them in 

 general terms, and stated my belief that they may have belonged to 

 the species of Hylonornus. More recently other specimens have been 

 obtained, which enable me to refer these specimens in part to the 

 present species and in part to the next species, Hylonornus Lyelli. 

 The specimen represented in Fig. 143, I believe, for reasons stated in 

 my memoir already referred to, to be the skin of a portion of the 

 hinder part of au individual of the present species. 



Hylonornus Lyelli, Dawson. 



In the original reptiliferous tree discovered by Sir C. Lyell and the 

 writer at the Joggins in 1851, there were, beside the bones of Den- 

 drerpeton Acadianum, some small elongated vertebras, evidently of a 

 different species. These were first detected by Prof. Wyman in his 

 examination of these specimens, and were figured, but not named, in 

 the notice of the specimens in the Journal of the Geological Society, 

 vol. ix. In a subsequent visit to the Joggins, I obtained from 

 another erect stump many additional remains of these smaller reptiles, 

 and, on careful comparison of the specimens, was induced to refer 



