364 Review of the New York Geological Reports. 



are especially numerous. Dr. E. thinks it is confined to the 

 Trenton limestone. A trilobite occurs in the West so like this, 

 that it is hardly possible to distinguish them; it is found at 

 Cincinnati, Ohio, and also at Madison, Indiana, even three hun- 

 dred or four hundred feet above the Graptolite beds and strata 

 containing Triarthus Beckii. If it really is the same species, 

 it holds a higher position or has a greater range than in New York. 

 Fig. 7, is also exceedingly abundant, particularly near Glen's 

 Falls. We think it somewhat doubtful whether it be the true 

 tessellatus. The western tessellated trilobite, found near high 



