37 



B.M. 



Antero-posterior diam. of alveolus of inner 



incisor 0,008 



Antero-posterior diam. of alveolus of 



outer incisor 0,013 



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 0,013 



Length of crown of pm. 2 0,0158 



This specimen is important, because no portion of the 

 mandible has been described by Pilhol. It is considerably 

 larger than the mandible of 0. forcipata, Cope *, which is 

 the largest American species, and the incisors appear to 

 have been inclined more directly forwards. 



Purchased, 1884. 



Limb-bones of Hycenodontidce 2 . 



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 Pterodon. 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 Eocene of Vaucluse. 



Bravard Collection. Purchased, 1852. 



27576. The greater portion of the right humerus of a large species ; 



1 In the Report U.S. Geogr. Surv. W. of 100th Meridian, TO!, iv. pt. 2, 

 pi. xxxri. (1877), a fine specimen of the mandible is figured. 



2 These specimens are mainly referred to this family on the authority of 

 Bravard. 



