15 



feline tribe ; whilst all the other humeri are imperforate and correspond 

 with the lower figure in Hunter's plate. But the perforated fossil 

 humerus figured by Cuvier differsfrom that of the White Bear figured by 

 Hunter in the shorter deltoid ridge, the narrower proximal and distal ex- 

 tremities, the convex outline of the supinator ridge, and the inferior pro- 

 duction of the inner condyle ; in short, in all those characters by which 

 the imperforate fossil humerus has been shown above to differ from that 

 of the White Bear. Not any of the three fossil humeri in the Hunterian 

 Collection have the perforation of the internal condyle ; and amongst the 

 extremely numerous humeri that have since been obtained from the bone- 

 caves of Germany, not any have been found to present the perforation 

 which Cuvier regards as the specific character of this bone in the Ursus 

 spelaus ; it is most probable, therefore, as Professor De Blainville con- 

 jectures, that the perforation in question is an accidental anomaly. 



51\ The left humerus of an immature Grisly Bear; the relative breadth of 

 the distal extremity arising principally from the great extension of the 

 internal condyle surpasses that of the White Bear, and, a fortiori, differs 

 from that of the Ursus spelmus ; this difference is the more satisfactory, 

 as it is founded on the comparison of the bone of a young Grisly Bear 

 with that of an old Cave Bear ; proving that the greater development of 

 the internal condyle is not a character or consequence of age. 



52. The right ulna of the Cave Bear {Ursus spelmus). 

 From the bone-cave of Gailenreuth. 



Presented by the Earl of Enniskillen. 



52 1 . The right ulna of a Grisly Bear (Ursus ferox). 



52 s . The right ulna of a Polar Bear (Ursus maritimus). 



The ulna of the Cave Bear, compared with one of the Polar Bear 

 of the same length, is less straight, being more convex towards the ra- 

 dius ; it is thicker, particularly at the anterior part of the shaft ; the 

 ridge on the outside of the distal end of the bone is more produced ; the 

 styloid process is more pointed ; and the concavity on the inner side of 

 the proximal articular surface is deeper. 



