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Review of the Neio York Geological Reports, 



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

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

 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 hig 



