118 
CREODONTA. 
Stypolophus hians, Cope. 
Plate xxxviii, figs. 12-20. 
This species is represented by the greater part of the skeleton of one 
individual. The bones are remarkable illustrations of the result of pressure 
when in a plastic condition; their surfaces cracked in every direction, so 
that each one is a mosaic of pieces; but in many instances the normal form 
of the bones is preserved. Under these circumstances, I have concluded to 
describe it, as the unusually complete skeleton throws much light on the 
structure of the genus, and as the largest species of the genus, it may be 
profitably compared with the S. viverrmus, the smallest. 
The greater part of the skull with the mandible is preserved, but the 
teeth are all broken off. There were, however, seven molars in the upper 
jaw, indicating that the species is not an Oxycena. The last two lower molars 
are subequal, and the last superior molar is transverse. A character which 
distinguishes this species from the S. strenuus, besides its superior size, is the 
diastemata which separate the premolar teeth from each other in both jaws. 
These interspaces are as long as the long diameters of the teeth themselves. 
The infeiior margin of the mandibular ramus is thick and slightly ascending 
anteriorly, where it gives exit to a remarkably large canine tooth, one which 
exceeds in relative dimensions that of any other described in these pages. 
Its section is a vertical oval, flat on the inner face, d'he roots of the supe¬ 
rior molars are as follows: First and second simply two-rooted. The third 
has the posterior root of double the usual width, its long diameter directed 
inward and forward, indicating the presence of a posterior or interior heel. 
The fourth premolar and first and second true molars subequally three- 
rooted ; third true molar transverse, only two roots visible. The diastema 
between the canine and the first premolar is in both jaws so extensive as to 
lead to the impression tliat a premolar exists, perhaps with a single root, as 
in Oxycena liipina^ but no such root or alveolus is discoverable; whence the 
first premolar is two-rooted. The diastema following the latter is almost 
equally great, but the third and fourth pemolars are in juxtaposition. The 
foramen infraorMtale posterior is above the anterior part of the fourth pre¬ 
molar. A character distinguishing this species from tlie S. viverrinus is seen 
