264 Lhe Creodonta. [ March, 
Among the Creodonta I have only observed it elsewhere in the 
genus Mioclænus, but the vertebrae of many of these animals 
are unknown. It is wanting in Thylacinus and the opossum, and 
rudimental in Sarcophilus, among marsupials. 
Three species of the genus Mesonyx are known, M. ossifragus 
G, 6.—Mesonyx ossifragus Cope, skull gue to postgleno E pro ee 
sive, ‘from below; on e-third dates! size. the Was = 
iginal, from esau. S. Geol. Surv. ide tage Va H a en. 
Cope, from the Wasatch Eocene, and M. lanius and M. n 
Cope, from the Bridger. The last named is the type claws W” 
the size of the wolf, and had more slender feet and 
1 Proceedings American Philos, Society, 1833, p. 543- 
