146 ME. E. T. NEWTON ON THE EEMAINS OF A 



trochlear surface, while anteriorly the intercondylar depression {b, a) is seen to form a 

 double ancle, an inner obtuse angle at «, and a more acute outer one at b, the latter 

 bein°- marked by a natural fissure, also seen in the front view of the bone. The 

 trochlear surface curves upwards at the back, and in a side view (PI. XXIX. figs. 8, 9, 

 pt.s) the inner and outer parts are seen projecting well beyond the shaft of the bone, as 

 the prominent condyles (i.c and o.c) do in front. The inner epicondylar tuberosity 

 (PL XXIX. figs. 7, 8, i.t) is prominent and angular, the surface of the bone in front, 

 as well as below and behind it, being distinctly concave. The outer epicondylar 

 tuberosity (o.t) is also well developed, but rounded and not quite so prominent as the 

 inner one ; it is placed towards the back of the condyle, and a flattened space intervenes 

 between it and the rugosity a little above it {fib.), the latter probably indicating the 

 position of the lower end of the fibula. Below and in front of the outer tuberosity is 

 a deep depression (PI. XXIX. fig. 9). The section of the shaft at about an inch and 

 a quarter above the bridge is nearly semicircular (PI. XXIX. fig. 7 a). The parietes 

 of the bone at this part are about 6 or 7 millimetres thick, and the interior is filled 

 with a remarkable network of cancellated bony tissue, now covered with iron pyrites. 



The second specimen (PI. XXVIII. figs. 1, 2, 3) is a right tibio-tarsus, somewhat 

 smaller than the one just described, but having a large part of the shaft preserved. 

 The lower and front parts of the distal articulation are quite perfect, as well as the 

 bony bridge, and a close comparison of these important parts with the first example has 

 not revealed any difference between them worthy of notice, except as regards size. 

 Indeed so close is their agreement, that if they had been of the same size one could 

 scarcely have resisted the conclusion that they were right and left bones of the same 

 individual. It will be unnecessary therefore to say more about the form of the lower 

 end of this bone, except that, as there is a longer piece of the inner side of the shaft 

 preserved, it shows in a more marked manner the extent to which the inner condyle 

 projects inwards beyond the general direction of the shaft (PL XXVIII. fig. 2). 



About 10 inches of the upper part of the shaft of this bone is preserved, including 

 the whole length of the fibular articulation {fib. art) ; but, unfortunately, some of the 

 pieces connecting the shaft with the distal parts have not been recovered. In the 

 figure, however, these parts are restored in outline from the third specimen, to be 

 presently described (PL XXIX. fig. 12), and as this supplies the part of the shaft 

 which was wanting, we can be almost certain of the exact relation of the upper to the 

 lower part of the bone. After a careful comparison of the two specimens I do not 

 think that the bone before it was broken could have been much longer or shorter than 

 51 centimetres (it is represented, half natural size, in fig. 2, PL XXVIIL). The outer 

 side of the shaft, from end to end, is nearly straight, or perhaps a little convex, the 

 fibular articulation {fib .art) projecting beyond the general contour. The inner surface 

 is deeply concave from end to end, even in the present condition of the bone, and when 

 perfect the upper end must have projected still further inwards, and so increased this 



