402 



PALEONTOLOGY OF OHIO. 



side. The narrowed portion left in the middle behind has a convex 

 outline. Sculpture none. The form resembles remotely the correspond- 

 ing scute of Tuditanus punctulatus, the posterior narrow face representing 

 the xiphisternal process of that species. 



EUKYTHOEAX SUBLEVIS, Cope. 

 Proceedings of American Philosophical Society, 1871, 177. 



The specific characters expressed by this shield are best perceived in 

 the measurements. 



Length, .0716 m. ; greatest width (imperfect), .078; width of lateral 

 concavity, .039; Some delicate radiating gtooves are seen on the ex- 

 posed surface, but they are very shallow. They are not visible on the 

 faces of contact. 



This represents one of the largest species of this fauna, having per- 

 tained to an animal of probably four feet in length, perhaps longer. It 

 will be desirable in future to compare it with the corresponding part of 

 the Tuditanus Huxleyi, though the latter, so far as known, is the smaller 

 ;-epecies. 



Sauropleuea, Cope. 



Proceed. Acad. Philad., 1868, p. 215 ; Transac. Amer. Philos. Soc, 1869, p. 15. 



Vertebrae and ribs well developed ; limbs four, rather large, five digits 

 in the fore foot; carpus cartilaginous. Ventral armature of closely 

 .arranged rhomboidal scuta, arranged in lines, which are closely placed 

 in chevrons, with the angle anterior. 



In neither of the species of this genus have the usual three thoracic 

 :shields been observed. The abdominal scuta, on the other hand, are much 

 Jike those of Colosteus, but are very much thinner.* So far as known, 

 there is considerable resemblance between these genera, but the osseous 

 vertebral column and ribs of Sauropleura are unknown in Colosteus. The 

 long ribs and strong limbs of this genus are proportioned much as in 

 true lizards. 



The cranium referred to the S. Newberryi partakes of the characters of 

 :the abdominal scutella in its light construction. The teeth are of the 

 Labyrinthodont type, with deeply inflected enamel and acute apex. 



* When I state (Transac. Acad. Philos. Soc, 1869, p. 16) that Sauropleura lacks the 

 ventral armature, thoracic armature is intended. 



