Review of the Neio York Geological Reports. 365 



water of the Ohio, opposite Cincinnati, has been referred to the 

 same species; it is however most probable that it is distinct both 

 from this and the T. caractad. 



Fig. 6 is not so common as the preceding, but it evidently has 

 a wide range, as it has been found in Wisconsin on Sec. 5, T. 5, 

 N. R. 1 W. of 4th P. M. 



These are the univalves of the Trenton limestone most wor- 

 thy of note, on account of their wide range. 



Plate 101, fig. 2, Pleurotomaria lenticularis. 3, Suhulites elan- 

 gata. 6, Bellerophon bilobatus. 



Vol. XLVii, No. 2.— July-Sept. 1844. 



47 



