90 URSID®. 
between the canine tooth and the first of the series of four 
molars; the complicated crown of the first and smallest of 
these persistent teeth, and the superior breadth of the fourth 
molar as compared with that in the common and Grisly 
Bears.* The size of the Bacton fossil is not equal to that of 
the jaw of the largest specimens of Cave Bear, but it exceeds 
some of the jaws which have apparently belonged to young 
females of the Ursus speleus: it measures ten inches three 
lines in length, and the length of the series of molars is 
three inches and a half. In the lower jaw of an Ursus 
speleus from the Gailenreuth cavern, now in the British 
Museum, measuring eight inches nine lines in length, the 
series of four molars is three inches ten lines in length; in 
another jaw of the Ursus speleus from the same locality 
measuring twelve inches in length, the series of molar teeth 
is also three inches ten lines in length; and these impor- 
tant and least varying instruments of digestion precisely 
correspond in number, size, and structure, with those in the 
shorter jaw. 
In the Ursus priscus, and the largest specimens of 
European, Polar, or Grisly Bears, the specific differences in 
the forms and proportions of the molar series of teeth are 
readily recognisable, although the total length of the jaw may 
exceed that of the jaws of the young, and probably female 
Spelzan Bears, which have acquired their adult dentition. 
An idea of the formidable size which the old males of the 
Ursus speleus attaimed in this country, may be estimated 
by the upper canine tooth, from the cave at Kairkdale, 
figured by Dr. Buckland,+ and by the one here figured (jig. 
29) from Kent’s Hole, Torquay. It matches the canine 
teeth of the largest of the continental specimens of the 
Ursus spelaus, the size of which extinct Bear Cuvier says 
must have equalled that of a large Horse. 
* Fig. 35, 6. + feliquie Diluviane, P\. 6, fig. 1. 
