32 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I3I 



CLAENODON, cf. MONTANENSIS (Gidley), 1919 

 Plate 7, figure 4 



A range in size of teeth indicated by about five claenodont speci- 

 mens in the Bison basin suite inchides the proportions of the type of 

 Claenodon montanensis from the Torrejon stage of the Montana Fort 

 Union. All these tentatively referred materials, as well as those of 

 the smaller form discussed above, were derived from the vicinity of 

 the saddle locality below the south rim of the Bison basin. There 

 would appear to be no characters of significance in the rather frag- 

 mentary materials of this intermediate species which would serve to 

 distinguish it from that of the earlier C. montanensis. Moreover, I 

 suspect that additional material may render difificult its clear separa- 

 tion from that represented by the materials referred to C. procyo- 

 noides. 



MEASUREMENTS IN MILLIMETERS OF TEETH IN SPECIMEN OF 



Claenodon, of. montanensis (gidley), u.s.n.m. no. 20574 



M3, anteroposterior diameter : greatest transverse diameter 9-5": 7-5 



M3, anteroposterior diameter : greatest transverse diameter 9.8:6.3 



" Approximate. 



CLAENODON, cf. FEROX (Cope), 1883 

 Plate 7, figures 2, 3 



A somewhat larger series, including at least nine specimens, is most 

 nearly comparable to the materials of Claenodon ferox that in the New 

 Mexico collections were earlier distinguished as Claenodon corruga- 

 tus, or the lower portion of the size range for C. jerox. As well as 

 jaw portions, there are in this group three fragmentary maxillae, each 

 with two molars, and an isolated P^. In the portion of the histogram 

 representing this material the three individuals indicated by dashed 

 lines have M3 preserved rather than M2, and proportions of the latter 

 are estimated by comparison with teeth in a better preserved indi- 

 vidual of this group, U.S.N.M. No. 20633. 



Whether or not the form represented by this group of specimens is 

 the same as that tentatively referred to C. montanensis, there seems 

 no certain evidence ; nevertheless, the extremes in size when combined 

 are strikingly far apart, and any attempt to group them together with- 

 out rather conclusive evidence would seem an incompatible arrange- 

 ment. Moreover, it should be particularly noted that although the 

 actual size range of the individuals in such a lumped arrangement 

 might be no more than in the C. ferox material of the Torrejon, the 

 percentage of difference in the series is very much greater. For this 



