238 
NOTOTJIEllIUM INERME. 
crowns of tlic rest are broken away: the base of the third 
remains, which gives an indication of a middle transverse 
valley, which most probably separated two transverse emi¬ 
nences.” 
The second fragment of a jaw exhibits the concavity along 
the lower part of the inner surface of the ramus, formed by the 
bending in of its lower margin continued from the angle of 
the jaw. 
The astragalus alluded to is described its a broad, sab- 
depressed, and sub triangular bone, the angles being rounded 
off, especially the anterior one ; the upper or tibial surface is 
quadrate, concave from side to side, in a less degree convex 
from before backwards : a ridge extending in this direction 
divides the tibial from the fibular surface, which slopes out¬ 
wards at a very open angle, and maintains a nearly horizontal 
aspect, presenting an oblong trochlea for the support of the 
fibula, shallower, and one-third smaller than that of the tibia. 
The tibial articular surface is not continued on the inner side 
of the astragalus, but its anterior and internal angle, which 
becomes convex in every direction, is directly continued into 
the anterior scaphoidal convexity, which sweeps round a deep 
and rough depression, dividing the outer and anterior part of 
the tibial trochlea from the corresponding half of the sca¬ 
phoidal convexity; this has the greatest vertical extent at its 
inner part, where it is separated by a narrow rough transverse 
channel from the part which rested upon the os calcis. The 
calcaneal surface is single, and covers almost the whole of the 
under part of the astragalus: the greatest proportion of it is Hat 
and renifbrm ; an angular tuberosity or process being continued 
from the concave margin, where the pelvis of flic kidney, to 
pursue the comparison, would ho situated. On the inner 
margin of this calcaneal surface, opposite the tuberosity, a 
small triangular flattened surface is continued upwards upon 
