80 CARBONIFEROUS TRILOBITES. 



diminishing toward the hind extremity ; part of segment prolonged beyond the 

 marginal line free from tubercles. 



Horizon and Locality. — Cuyahoga Shale of Lower Carboniferous, Akron, Ohio. 



It will of course be understood that the reference of the specimen to the genus 

 Dalmanites is provisional only, and must await for confirmation the discovery of 

 other parts of the carapace. I may add that since the above description was 

 written I have found a second specimen and seen a third, both very imperfect, and 

 only sufficient to support the statement of the existence of this type in the Lower 

 Carboniferous rocks. 



