HY EZNODONTID&. oi 
B.M. 
Antero-posterior diam. of alveolus of inner 
TSO. Sees ORL ae 0,008 
Antero-posterior diam. of alveolus of 
MRECESENCISOL ...s Speers at he ste sss 0,018 
Interval between canines ............ 0,026 
It will be seen that the only difference in the two 
specimens consists in the superior size of the first premolar 
in the present specimen. Purchased, 1884. 
M. 1693. The symphysis of the mandible; from the Upper Eocene 
of Escamps, near Lalbenque (Lot), France. This specimen 
shows the alveoli of the canines and the first premolars, 
the second premolars, and parts of the third. The dimen- 
sions are as follows :— 
Length of symphysis superiorly .......... 0,067 
Vertical diameter of alveolus of canine .... 0,019 
Transverse _,, = - Poe OL Ls 
Menor or crow! Of pm ys. ws se a 4s 0,0158 
This specimen is important, because no portion of the 
mandible has been described by Filhol. It is considerably 
larger than the mandible of O. forcipata, Cope’, which is 
the largest American species, and the incisors appear to 
have been inclined more directly forwards. 
Purchased, 1884, 
Limb-bones of Hyenodontide’. 
A large series of limb-bones probably belonging to this family are 
contained in the Museum, and many of these have been labelled 
Hycenodon or Ptierodon. There do not appear, however, to be any 
reasons known for assigning any of them to one genus rather than 
to the other; and they are accordingly entered here merely as 
belonging to the family, although suggestions are in some instances 
made as to the species to which they may possibly belong. 
28165. Glenoidal extremity of the right scapula of a large species ; 
from the Upper Hocene of Vaucluse. 
Bravard Collection. Purchased, 1852. 
27576. The greater portion of the right humerus of a large species ; 
* In the Report U.S. Geogr. Surv. W. of 100th Meridian, vol. iv. pt. 2, 
pl. xxxvi. (1877), a fine specimen of the mandible is figured. 
* These specimens are mainly referred to this family on the authority of 
Brayard. 
