306 Prof. E. W. Claypole — On a New Carboniferous Trilohite. 



DaLMANITES ? CUYAHOGAE, sp. nOV. 



Head and thorax unknown. Pygidium about as broad as lon^, 

 exclusive of the spinous processes to be mentioned below : distinctly 

 trilobate. Middle lobe occupying a full third of the breadth, extend- 

 ing nearly to the hind extremity, distinctly separated by a furrow 

 from the lateral lobes, and containing 11 or 12 ridges or partial rings. 

 Lateral lobes as wide as the median lobe, their segments or ribs pro- 

 duced for the most part about half their length beyond the marginal 

 line formed by their union and ending in points, the 3rd, 7th, and 

 9th produced to double the distance and having the appearance of 

 spines. The 3rd pair curve backward so that their points are level 

 with the hind end of the pygidium. No marginal tract. Whole 

 surface set with tubercles, of which there are five on each of the 

 three parts of the first ring, the number gradually diminishing 

 toward the hind extremity ; part of segment prolonged beyond the 

 marginal line free from tubercles. 



Horizon and Locality. — Cuyhoga 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 con- 

 firmation 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. 



It may be advisable to add a few lines containing a summary of 

 the evidence on which rests our belief of the Carboniferous age 

 of the Cuyahoga state. The section composing this part of the 

 geological column in Northern Ohio is as follows : — 



Lowest Coal. Berea Shale. 



Conglomerate. Bedford Shale. 



Cuyahoga Shale. Cleveland Shale. 



Berea Grit. Erie Shale. 



In this series the line separating the Carboniferous proper and the 

 Lower Carboniferous is drawn by Dr. Newberry, ex-State Geologist, 

 between the Conglomerate and the Cuyahoga Shale, and that separat- 

 ing the Lower Carboniferous and Devonian is placed between the 

 Erie and Cleveland Shales, The evidence from the contained fossils 

 is given in full below. 



Fossils of Lower Cakboniferous Eocks of N". Ohio. 



Cuyahoga Shale .... Ctenacanthus formosus, Newb. 

 Berea Grit .... Ctenacanthus formosus, l^evi'h. 



Annularia longifolia, Brong. 

 Berea Shale 

 Bedford Shale .... Ctenacanthus formosus, Newb. 



Orthis Michelini, L'Eveille. 



Streptorhynchus crenistriatwm, Phil. 



Chonetes Logani, Mor. and Pratt. 



Mhynchonella Sagerana, Win. 



Spiriferina soUdirostris, White. 



Syringothyris typus, Win. 



