394 PALEONTOLOGY OF OHIO. 



In a third individual, without head or thoracic region, but in which the 

 ribs and hind limb are similar, as well as the general proportions, the 

 vertebrae are distinctly ossified, but its reference to this species is uncer- 

 tain. 



Remains of both fore and hind limbs are preserved. They are rather 

 stout, not large, and with short phalanges. The number of these is not 

 distinguishable. 



Length of femur No. 1, 0.060 m. ; length of tibia and fibula No. 1, .050 ; 

 length of anterior phalanx No, 1, obverse, .0285; length of femur No. 2, 

 .060; length of tibia and fibula No. 2, .070; length of femur No. 3, .052 ; 

 length of posterior phalanx, .026. 



The deficiency of length of the tibia in No. 1 is probably due to im- 

 perfection of the specimen. There are bones of the fore limb in No. 2 

 which are not determinable. The ribs are rather long and little curved. 

 The caudal extremity is not complete, but was evidently well developed. 



Length from head to femur, 0.0356 m. ; length of head, .0154 ; width do. 

 behind, .0175 ; width do. interorbital, .0042 ; length of orbit, .0040. 



TUDITANUS EADIATUS, Cope. . 

 Transactions American Pbilosophical Societ}'^, April, 1874. 



Represented by crania of. several individuals, one of which is nearly 

 perfect, and is selected for description ; others are more or less complete, 

 and present the prominent peculiarities of the species. 



The marked character of this form is seen in the very anterior position 

 of the orbits and contraction of the muzzle. The orbits are large and 

 separated by a little more than their own diameter ; their posterior bor- 

 der is in front of a line measuring the anterior third of the length to the 

 supraoccipital crest, and nearly at the line marking the fourth of the 

 length to the quadrate region. The posterior outline of the skull is 

 deeply concave, the quadrate angle projecting beyond the occipital con- 

 dyles, which are themselves quite prominent. The osseous segments 

 composing the cranium are from the orbital region posteriorly, three 

 median and four lateral on each side. The supraoccipital is rather 

 small, and is broader than long. Its posterior border is straight, as are 

 the short lateral margins. The anterior suture presents an obtuse angle 

 forwards. A large rhombic plate occupies the parietal region, which is 

 probably divided longitudinally by a suture, and represents the parietal 

 bones. It extends, narrowing, nearly to the orbits, wherethe middle line 

 is occupied by the much smaller frontal. The suture between the two 

 is obscure, but seems to form an emargination of the parietals. There 

 is a subtriangular postfrontal which expands posteriorly, and is sue- 



