Review of the New York Geological Reports. 



Plate 34, p. 103, Hall's Report. 



311 



Homalonotus delphinocephalus. 



the matrix enclosing the two is very different, and though there 

 is some resemblance in the heads of the two species, he considers 

 them quite distinct. 



The following are the most common forms of Strophomena 

 in the Niagara shale. 



