On the Recent and Extinct Irish Mammals. 61 
The dimensions of these three femora are as follows :— 
Femur Femur Femur of 
from Loch | from Shan- Ursus 
— Gur, don Cave. | maritimus. 
Pl. IV., figs.) Figs. a and | Figs. 1 and 
3 and 6. 5. 4, 
Inches. Inches. Inches. 
Length, . : : 18°8 7s 15° 
Antero-posterior diameter below trochanter minor, 16 1:2 1-2 
Breadth at ditto, : : : : 2°5 2° 2:2 
Width of tibial articular surface, : ¢ 3 3°8 3-4 34 
Antero -posterior diameter, inner er condyle, 3°6 3° 3-1 
Thickness of ditto, ° 18 16 1°6 
The above data and figures (Plate IV.), fully confirm Owen’s 
descriptions of the humerus and femur of Ursus maritimus, with 
reference to their stoutness, as compared with recent and fossil 
species. 
Theneck ofthe Loch Gur femur, as shown in Pl. IV., fig. 3,ismore 
perpendicular than in the other two; but I find that this is a 
character occasionally observed in the femur of Ursus arctos. The 
trochanteric pit is also small, narrow, and deep (fig. 3); but there 
is considerable roughning of the bone all round the part, which 
might indicate disease, such as produced the ankylosis of the first 
and second cervical vertebree. 
The fibula from Loch Gur is 12'5 inches in length. I also com- 
pared it with the same bone in Ursus maritimus, Ursus ferox, 
and Ursus arctos; (but unfortunately I could not obtain a speci- 
men of Ursus fossilis, wherewith to compare it.) But the fibula 
of the Polar Bear is very different in several parts of the shaft 
from the above. For example, at the outer and distal third, and 
anteriorly in the upper third, and in the inner aspect of the shaft 
generally, especially towards the head. Again, the relatively 
greater thickness of the extremities of the fibula of the polar 
species is in keeping with its other long bones. Ail conspire to 
show that there is no character in common between the bones 
from Loch Gur and the same parts of the Polar Bear, as far as the 
data here shown extend; whereas the latter species differs widely 
from the former and from the Shandon bones, and equivalent parts 
of Ursus ferox, Ursus arctos, and Ursus fossilis. In fact, 
the Loch Gur remains are not distinguishable from remains of 
Ursus fossilis of Goldfuss, and Ursus ferox, and Ursus arctos, but 
are very distinct from the same parts of the Polar Bear. 
