406 PALAEONTOLOGY OF OHIO. 



of mucli smaller size than those of the jaws, belongs to the vomerine or 

 a palatine series. The row is single and uniform. 



The superior face of the cranium is injured, but the component bones 

 appear to have possessed a radiating sculpture of no great distinctness. 



The form of the body seems to have been long and fish-like, with little 

 contraction near the limbs. Caudal extremity is not preserved. There 

 are three metacarpals of the anterior limb preserved. A narrow longi- 

 tudinal bone extends posteriorly from the lateral pectoral bone. Its ex- 

 tremity is broken, but a flat, narrow, longitudinal bone, with a dilated 

 extremity curved outwards, may belong to it, or be the humerus. I find 

 no distinct traces of branchial arches. 



The affinities are thus obviously to Sauropleura, and it is not beyond 

 possibility that future investigations may prove it is the same, though 

 this is not probable at present. 



Portions of seven individuals of one species, and of one each of two 

 others, have been obtained by Dr. Newberry at the Linton locality. 

 They may be distinguished as follows : 



Surface of the thoracic bones pitted, witli numerous radiating grooves 

 prolonged from elongate pits C.foveatus. 



Surface of bone with numerous deep grooves separated by sharp, ele- 

 vated ridges, about twenty on a lateral shield C. scutellatus. 



Surface of bones with few shallow grooves, median with interrupted 

 wrinkles, lateral with 10 to 12 low ridges C. pauciradiatus. 



COLOSTEUS FOVEATUS, Cope. 

 Loc. cit., p. 24. 



A very elegant sculptured median pectoral plate represents this Ba- 

 trachian. It is larger than most of those of C. radiaius, but smaller 

 than the one last described. The posterior and median parts of the 

 plate are pitted to the number of six in five mm. The pits are sepa- 

 rated by sharply defined ridges. They elongate towards the anterior 

 parts of the plate, resembling elongate hexagons, and the ridges ap- 

 proach radii, though not more elevated than the cross septa. The 

 beveled margins are rugose also, except at the edges. 



Length of the bone, .045 m. ; greatest width, .025 ; width of posterior 

 margin, .021. 



From Linton, Columbiana county, Ohio. Prof J. S. Newberry, Coll. 

 No. 20. 



