360 PALiEONTOLOGY OF OHIO. 



As compared with the corresponding fauna of the Coal Measures of 

 Great Britain, as exhibited in the writings of Huxley, AUman, Hancock 

 and Arthey, Barkas and Miall, a number of points of resemblance can 

 be detected. But in the first place, snake-like forms of the character of 

 Phlegethontia have not been detected by the authors quoted, nor has the 

 Proteoid type been described by them, as represented in our fauna by 

 Cocytinus. On the other hand, the large types allied to Labyrinthodon 

 are still unknown in America. But of Microsaurian genera there are a 

 number of correspondences. Oestocephalus is represented by Urocordylus, 

 and Ptyonius by Lepterpeton ; Dolichosoma is similar to the former and to 

 Hyphasma • Colosteu^ is our representative of Archegosaurus. Ceraterpeton 

 is the only genus common to the two continents. It is worthy of remark 

 that in the Ohio Batrachia the dermal defenses consist usually of slen- 

 der rods, while in most of those of Great Britain these are replaced by 

 rows of narrow scutella. 



The locality from which these fossils were procured is near Linton, 

 Columbiana county, Ohio, near Yellow Creek. The locality is thus near 

 to the Pennsylvania State line and the Ohio River. They occur in a 

 small basin near the middle of the series, in the lower part of the "dia- 

 mond bed." This is eight feet in thickness, and the fossil Batrachia and 

 fishes are found on the slate, which is in contact with the lower three to 

 six inches of the seam, which is cannel coal. 



It is to be observed that the specimens are in some cases quite obscure, 

 and altb ugh little or nothing of a doubtful nature has been introduced 

 into the following descriptions, yet the elements are sometimes covered 

 by a thin layer of carbonaceous matter, which prevents their entire defi- 

 nition. 



?PEOTEIDA. 



Cocytinus, Cope. 



Proceedings American Philosophical Society, 1871, p. 177. 



Vertebrse and ribs osseous ; anterior limbs, thoracic shields and abdom- 

 inal armature apparently wanting ; teeth on the premaxillary bone, none 

 on the maxillary; hyoid elements largely developed, an axialhyal with 

 basihyal on each side, closely united with the corresponding ceratohyal, 

 at the end of which is an element in the position of a stylohyal; hasmal 

 or basal branchihyals, three, the anterior two each supporting one pleu- 

 ral branchihyal and the third supporting one also, the first or anterior ? 

 haemal branchihyal on the inner side of the ceratohyal, approaching the 

 median line, and with elongate pleural element; urohyal not seen. 



