1865. ] LOWER JAW IN THE CACHALOT. 391 
Fig. 1. 
This second specimen (fig. 1) is another illustration of the same 
kind of twisting as the one already described, and resembling it in 
being towards the right side; but in this case the jaw has been sawn 
across merely to preserve the interesting part of it ; though, from the 
proportional size of the piece, compared with adult specimens in the 
same museum, one has no hesitation in referring it also to a young 
animal. The total length of the bone in a straight line is 23 inches, 
but following the curve it is as much as 33 inches. It contains nine- 
teen sockets for the teeth. The ramus of the jaw seems normal as 
far forwards as the symphysis ; thence inclining at a slight angle out- 
wards for about a distance of 14 inches, it makes again a sudden 
sharp turn outwards, and then a second as quickly backwards, so as 
to resemble a hook in figure. The plane of the bone is also very 
much altered in position ; this is best observed by following the course 
of the alveoli and sockets of the teeth. The extremity towards 
the ramus (where the jaw is cut across) has the alveolus in the na- 
tural position; but the fourth and fifth sockets forwards from this 
exhibit a slight inclination outwards; and this alteration of the 
sockets and plane of the bone goes on to the centre of the concavity 
of the twist, where they are no longer above, but on the middle of 
the side, and with a direction backwards (fig. 1a). From this they 
still continue to alter in position to the extremity of the hook, where 
