60 ME. G. BUSE. ON THE ANCIENT OE 



III. Ursus. 



The Genista Cave has yielded a considerable number of bones of a species of Bear, 

 all of which were procured from the deeper passages. They are completely fossilized, 

 and thickly incrusted with hard ferruginous stalagmite. The principal specimens 

 are : — 



1. A portion of the right maxilla (PI. V. fig. 3), extending from the anterior border 

 of the first true molar to a short distance beyond the second, and containing both 

 teeth quite entire though a good deal worn. Their dimensions are, m. 1 -OEX'TO, 

 m. 2 l"-5 X '8. All the finer sculpturing is worn away ; and the third or posterior cusp on 

 the outer border of m. 2 is entirely obliterated. What remains of the sides of the tooth 

 indicates that the crown-surface must originally have been much compressed. 



2. The right mandible (PI. IV. figs. 1, 2). This specimen comprises the whole of 

 the horizontal ramus as far back as the angle, and showing the small inferior tincinus '. 

 The ascending ramus, including the condyle, coronoid process, and angle with the 

 " crochet"^, are wanting, having evidently been detached before the bone was invested 

 with stalagmite. The remainder of the jaw is complete. It includes the following 

 teeth or empty alveoli : — 



The empty alveoli of the three incisors ; the fang of the canine, broken off level with 

 the border of the alveolus ; the empty alveolus of the first premolar (pm. 1) ; the absorbed 

 alveolus of the third premolar (pm. oj, which was probably shed from violence ; the fourth 

 premolar (pm. 4) and first molar (m. 1) entire, and corresponding in amount of wear 

 with the maxillary teeth above described ; and the empty alveolus of the last molar 

 (m. 2). The length of the ramus from the incisive border to the extremity of 

 the uncinus is 8"-35, its vertical diameter immediately behind the last molar 2"-5, and 

 at the diasteme l"-9 ; the length of the diasteme is 1"'7, and of the symphysis 3"-0. The 

 teeth or sockets afford the following measurements: — 



in. 



Canine l-OOx-74 



pm. 1 •25x 20 



m. 1 1-07 X -50 



m. 2 1-13X-70 



m. 3 ^x-eO 



Molar series 3-20 



The lower border of the bone is thick and rounded but nearly straight. 

 3. The third specimen is about half the right ramus of a young animal, in which 

 the canine is only partly protruded from the alveolus. It contains that tooth entire, 



' " Crook-procees " of Ealconer. " " ADgular process " of Ealeoner. 



