80 URSID.E. 



the Ursus priscus with which it is compared, and to have 

 attained that age when no difference could be expected to 

 take place in the length of the interspaces of any of the 

 teeth. In all the characters in which the upper jaw of the 

 Fen Bear differs from that of the two species of Cave 

 Bear with which it has been compared, it agrees with the 

 Ursus Arctos. 



In regard to the two varieties of existing European Bear, 

 brown and black, held by some to be distinct species, the 

 entire skull in the Woodwardian Museum shows that the 

 most recent of the extinct British Bears, in its less convex 

 forehead, and the greater length of the sagittal crest, re- 

 sembled the Black Bear of Norway and Siberia, more than 

 it did the Brown Bear of the Alps and Pyrenees. 



As it may aid in the subsequent attempt to elucidate the 

 true specific characters of the extinct Cave Bears (Ursi 

 spelteus et priscus), as well as those of the existing Ursus 

 Arctos, I shall add a few observations arising out of the 

 comparison of the lower jaw of the Bear from the Manea 

 Fen. The specimen, which is in the collection of Sir 

 Philip Egerton, is the left ramus of the lower jaw. 



It equals in length the largest specimen of the lower jaw 

 of the Ursus spelteus, but differs from that species in the 

 more simple form of the last premolar, or the fourth 

 grinder, counting from behind forwards; for, whereas the 

 Cave Bear has two distinct tubercles and a ridge deve- 

 loped from the base of the principal cone of that tooth, in 

 the present species there is only the principal cone, as in 

 the Black, Brown, and White Bears. The Bear of the 

 Fen also differs from the Ursus speleeus in the shorter inter- 

 space between the last described molar and the canine, 

 even when its lower jaw is compared with the lower jaw 

 of a Cave Bear of less dimensions. The preceding inter- 



