The compiler of the incomplete papers left by Dr. Deane has not deemed 

 it desirable that he himself should undertake to describe, scientifically, such 

 impressions as Dr. Deane left no particular description of, especially as the 

 recently published work of Dr. Hitchcock, upon the Ichnology of Massachusetts, 

 embraces an account of perhaps all the species. He has therefore limited his 

 own attempts in the notices of the Plates, to obtaining references to the stones 

 from which they were taken, and the cabinets in which these stones are now 

 to be found ; to a determination of the species, and the works in which they 

 are described ; and more especially, to their identification with species given in 

 the Ichnology of Massachusetts ; adding such other matter of general character 

 as he judged might be of service. 



The colored lithographs are in the same style as those given by Isaac Lea, 

 Esq., of Philadelphia, accompanying his Memoir on the Sauropus primaevus, and 

 which were much admired. They represent well the prevailing tint of the sand- 

 stone. The drawings which were made by Dr. Deane on stone, it may be confi- 

 dently stated, can never be surpassed. Their accuracy makes the possession of 

 the Plates almost as valuable, even for scientific descriptions, as the original 

 specimens. 



The nine Plates, 16, 17, 31, 40, 41, and 43 to 46 inclusive, which it was 

 intended to give in photo-lithographs, are direct photographs from the original 

 stones, and are exquisite specimens of art. 



T. T. BOUVE. 



