CREODONTA. 
127 
worn surface. The posterior is produced by the superior canine, and the 
anterior by the exterior superior incisor. From the extent of the surface 
worn by the latter, I suppose it to be a large tooth. There is no indication 
of inferior incisors. 
Creodus incertse sedis I. 
Plate xxxvii, figs. 23-31. 
A number of well-preserved portions of the skeleton of a Creodont of 
about the size of the Stypoloplms muUicuspis furnish some important struc¬ 
tural characters. The mandibular ramus of the left side is preserved as far 
as the sixth molar, but the teeth are all wanting. The alveolus of the 
canine is of very large size, excluding the usual space for incisors seen 
in Carnivora. First premolar one-rooted, the others two-rooted, and all 
closely placed. The alveoli are large, indicating robust teeth. Mental 
foramina below anterior part of second and posterior part of the third pre¬ 
molars. The symphyseal suture extends to opposite the front of the third 
premolar. 
Two proximal caudal vertebrae are stout, wide, and with depressed 
centra. They have stout diapophyses at the base of the neural arch, which 
is wide. Centra weakly keeled below. Distal caudals have the usual elon¬ 
gate form. 
The proximal part of a scapula is preserved. This shows an interesting 
peculiarity in the form of the coracoid. This process forms the usual pro¬ 
tuberance at the end of the glenoid cavity, and its anterior border is turned 
inward, culminating in another tuberosity on the inner side of the first 
named. This incurved border incloses a deep groove with the body of the 
scapula. The spine is elevated, and commences abruptly. 
The shaft of the humerus exhibits a strong deltoid ridge, which is not 
flattened on its edge, and descends gradually into the shaft. The distal 
end in the specimen lacks the inner half The arterial bridge is present, 
and the supracondylar fossa is perforate. The external part of the condyle 
is separated on the posterior side from the external epicondyle, by a keel, 
which is like that of Canis., and which falls opposite the middle of the anterior 
face of that part of the condyle. External ligamentous pit deeply impressed; 
external border of lower end of shaft of humerus acute. 
