DRIFT DEPOSITS OF ILLINOIS. 



These fossils show so little of the wearing effects of transpor- 

 tation, as to impress one with the conviction that they were 

 derived from strata originally deposited at a locality not very 

 remote from the places where they were found. 



The following wood cuts represent the fossils now in the 

 author's possession, that were obtained from the drift clays of 

 Illinois, Iowa and Missouri. 



Nos. 1, 2 and 3 belong to the genus Lainna, a genus com- 

 mon to the Chalk and to the Eocene Tertiary. No. 8 belongs, 

 apparently, to the genus Oxyrhina, and closely resembles O, 

 crassa, Agassiz. 



