External Characters of the Bears. 381 



advancing a little further between the second, third, and 

 fourth toes than between the first and second and the fourth 

 and fifth. These pads, therefore, are susceptible of com- 

 paratively slight divarication. Moreover, the line of these 

 pads is only lightly and tolerably evenly curved, the pad of 

 first digit (pollex) lying alongside that of the second. It is 

 noticeable that the strip of integument joining these two 

 pads is a little wider than the others. In other respects the 

 fore foot conforms to the type of Euarctos am ericanus, except 

 that the hairy space between the digital and plantar pads is 

 much shorter*. 



The hind foot (fig. 2,13) with respect to the digital pads 

 differs similarly from that of Euarctos, with the additional 

 difference that these pads on the third and fourth digits are 

 themselves immovably fused together along the proximal 

 half of their juxtaposed edges and cannot be separated at 

 all. The plantar pad covers the sole of the foot almost as 

 far back as the tip of the heel, a relatively small portion of 

 the latter being covered with hair; and the divisional 

 depression passing inwards from the hallucal margin is both 

 shorter and narrower than in Euarctos, and is, moreover, 

 hairless. 



Finally, in both the fore and hind feet the pads are much 

 more coarsely papillate than in Euarctos. 



In the analytical table of the external characters by which 

 the genera of bears appeared to be distinguishable (P. Z. S. 

 1914, p. 940), I stated that the digital pads of the brown 

 hear and of the grizzly bear are separated throughout 

 their length. This was a double error, due to an exami- 

 nation of dried skins, to the necessarily superficial inspection 

 of the feet of living examples, and, in the case of U. arctos, 

 to my having only a newly-born cub, preserved in alcohol, 

 in my hands. 



In an adult example of U. arctos, from North Russia, the 

 feet generally conform to those of Duiiis korribilis, but they 

 differ in two particulars. The digital pads, although united 

 by webbing to approximately the same extent, are susceptible 

 of being more widely divaricated owing to the greater width 

 of the web. This applies both to the fore and hind foot. 

 Moreover, in U. arctos the pads of the third and fourth 

 digits of the hind foot are not immovably fused together 

 throughout the greater part of their length, but are quite 

 free, although not to precisely the same extent as the third 

 is from the second and the fourth from the fifth. The 



* A feature possibly attributable to my inability to straighten the 

 digits, owiii^- t<> the previous immersion in alcohol of the feet of 

 J), hombilis. 



