554 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. XXIX. 



higher elevation above tlie l)ase of the canine. {-2) Roth npper and 

 lower canines are comparatively larg-er, straij^hter, and yjlaced more 

 nearly vertical in the jaw. This, together with (3) the relatively 

 wider separation, especially of the upper canines, and (4) the somewhat 

 more prominent and more squarely set incisors, gives to the muzzle a 

 massive and more pug-nosed appearance than is observed in /*. lotor. 



The second molars, upper and lower, are relatively larger, and the 

 premolars are more closely crowded than is usual in the specimens of 

 P. lotor examined, but these dili'erences are perhaps not more marked 

 than would be seen in the extreme of individual vai'iation in this 

 direction. 



The following- is a table of comparative measurements of the type 

 specimen and an adult male of P. lotor from California. The two 

 specimens represent as nearly as possible individuals of equal ag-e, as 

 indicated bv a like degree of wear in the teeth. 



Measurements. 



P. simus 

 (No. 2634, 

 U.S.N.M.). 



Total length of lower jaw 



Total length of lower dental series 



Depth of jaw at wi] 



Depth of jaw at po 



Width across upper incisors 



Totnl width across upper canines 



Antcrojidstcrior diameter of canine at base 

 Diameters of ^4: 



Anteroposterior 



Transverse 



Diameters of v/^i: 



Anteroposterior 



Transverse 



Diameters of ;(/•.>: 



Anteroposterior 



Transverse 



mm. 

 90.0 

 53.5 

 16.0 

 17.5 

 18.5 

 31.5 

 8.0 



8.5 

 8.5 



9.0 

 10.0 



7.0 



8.5 



P. lotor 

 (No. 70948, 



U.S.N.M.). 



mm. 

 80.0 

 51.0 

 12.0 

 13.0 

 16.0 

 25.5 

 6.3 



8.5 

 8.0 



9.0 

 9.5 



6.0 



8.0 



EXPLANATION OF PLATE XIL 



Procyon .sv'tohs. 



Fig. 1 . Upper and lower jaws, side view. 



2. Upper and lower jaws, anterior view. 



3. Superior dentition, crown view. 



4. Inferior dentition, crown view. 



