CONNECTICUT RIVER SANDSTONE. 61 



smaller, and of different character altogether; in fact, impressions of fore feet, showing 

 the animal to have been a quadruped; most likely a reptilian, but possibly a marsupial. 

 Succeeding these last are other tracks, like the first mentioned, showing the animal had 

 resumed an advancing motion. 



Now this case is precisely such as supplies the contingency required to settle, in the 

 estimation of Dr. Deane, the question of the ornithic character of the footmarks. 



There is one other point which the writer will refer to. Dr. Deane considered some 

 of the impressions to have been made by bipedal reptiles, and so described them, which 

 have since been shown to have been made by quadrupeds. As in the case of the bird 

 tracks, so called, so of these it may be stated, that discoveries have been made since 

 he wrote, which would have changed his views respecting the animals to whom they 

 owed their origin. 



In the case of the Otozoum (see Plate 37 and description), a specimen exhibiting 

 the tracks of the fore feet has recently been presented to the Ichnological Cabinet of 

 Amherst. 



One reason why there are not full descriptions of all the footprints by Dr. Deane, 

 rather than of a portion of them, may be found in the fact, that he was constantly 

 making new discoveries in relation to them. This led him to delay writing the text 

 for the plates, as he reasonably judged that every additional day's investigation might 

 enable him to make his descriptions more serviceable. 



The writer has felt that justice to Dr. Deane required that these remarks should 

 be appended to the descriptions given ; and he hopes they may not be found entirely 

 useless, in the further purpose of imparting a little additional matter of interest con- 

 cerning the foot-prints. 



