490 



NATURE OF SUPPOSED FOSSIL TRACKS. 



Medina and Clinton beds. Whilst there are various strong objections, 

 therefore, to the assumed animal origin of these Climactichnites im- 

 pressions, there would appear to be really nothing of any moment to 

 militate against the assumption of their fucoidal origin. I am not, of 

 course, sanguine enough to imagine that the views advanced in this 

 communication will be readily accepted. Prejudices and preconceived 

 opinions are not easily abandoned : nevertheless, in view of the very 

 doubtful nature of these impressions, I would suggest that the generic 

 names by which they are at present known should be modified re- 

 spectively into Protichnides and Glimactichnides. The change, whilst 

 involving but a single letter, saves us from a too definite expression 

 of what may be, and to my thinking most assuredly is, an erroneous 

 view. 



University College, 



Toronto, May 21st, 1877. 



^^ 



