new Species of Dridsh Bear. 403 



foss'ilis bears, wliicli havo a siil)trianf!^ular tliird 

 molar. In the ^Nlaj^daleii College jaw this tooth is 

 subrcctangiilar with a sulcus down the outer side, 

 recalling- the U. speheas type of third molar. 



The dimensions o£ the four teeth are : — 



pmi. mi. m.^. m,. 



Leno-th 12-5 23 29 25 



Width 9-5 15 10-5 19-5 



The measures of tlie lengths of the molars of several 

 fossil Bears are given in the next table of comparative 

 dimensions. A comparison of the length of the molar 

 range with the distance of the canine was found to serve no 

 nseful purpose, except to demonstrate the variability of the 

 length of the diastema as compared with the length of 

 the range of molars. 



The dimensions of this jaw (in millimetres) as compared 

 with those of a selected series of lower jaws of other bears 

 in the British Museum are : — 



^ JU . - -.A 



<" O ?? r^ 05 ."^s <i> ^1 



vs ^"^ r=>w^ "^^tS^' vsos'^ 

 •S':;iO o2^i srrH <^r3o 



^^- . .^ - 



Total length c. 292 — -^ 242 ? 



Canine to condyle 275 257 ? — 230 



„ „pm, 47 ? 51 40 



Svmphysial area : 



'Lenotli 83 — 77 69 



Width 44 — 40 28 



Condyle width Go — — 45 



Top of condyle to lower side of 



angle 55 50 — — 



Length of molar range : 



nil +m., together 66-5 53 — 48 



m3 25-5 21 - 20 



Length of mi+m^i-l-ma ........ 82 74 — 08 



In the first place the Oxford jaw may be definitely dis- 

 tinguished from that of the full-grown Cave Bear, U. speheus, 

 on account of its smaller size; of the presence of an 

 alveolus close behind the canine, indicating a first ])rcmolar, 

 which with pnu and pnij is normally absent in Cave Bears; 

 of the absence of cusps on the inner side of pni^; of the 

 absence of tuberculation on nij. Moreover, the canine 



