026 GEOLOaY OF OHIO. 



Genus Asterosteus. Newberry. 

 Asteroeieas sienocephalus, Newb. 



Genus Acanthaspis. Newberry. 



Acanihaspia armalua, Newb. 



Genus Acantholepis. Newberry. 



Acantholepis pusiulosua, Newb. 



Genus Liognathus. Newberry. 



Liognathus 8;pahilatus, Newb. 



Genus Mach^racanthus. Newberry. 



Madiceracantliua major, Newb. 



" pei-aeutus, Newb. 



" sulcalus, Newb. 



Genus Cyrtacanthus. Newberry. 

 Cyriacanihua dentatu^, Newb. 



Genus Khynchodus. Newberry. 



Bhynclwdua secana, Newb. 

 " frangena, Newb. 



" crataua, Newb. 



The above list is meant to comprise all of the fossils that have been 

 described or identified from the Corniferous Limestone of Ohio. A 

 considerable number of these are included in the two volumes of Ohio 

 Paleontology, already published. Others have been described in the 

 reports of other States from Ohio specimens, and still others are species 

 that are common to the rocks of this age in various American localities, 

 some of them, indeed, belonging to the Old World as well. 



A few statements in regard to the horizons of some of the species will 

 be added here. 



The following fossils are found in Franklin county to have but very 

 little vertical range : 



About fifteen feet below the bone bed, Cystiphyllum Americanum often 

 makes up a large part of the rock for four or five feet. 



Eridophyllum Verneuilanum holds very closely to one horizon in Franklin 

 county. It is found about three feet below the bone-bed, and is coexten- 

 sive with the formation. Wherever the proper horizon is reached, this 

 fossil is found. This horizon has not been identified with that which 

 this fossil holds at Sandusky, but it is probably the same. The seas 

 seem to have been paved with it at the time when this layer was 

 forming. 



