PLATE 21. 
judged by the parts which are visible, somewhat of the 
shape of the nut itself : but, probably, of a much more 
perishable nature ; otherwise, we may reasonably suppose, 
it would more frequently occur in the fossil state. 
6 . As the shape of the exterior covering will scarcely be 
ascertained from the foregoing drawing, by those who do 
not see the original specimen, I have added this figure; 
which, I think, would be nearly the form and size of the 
husk, if detached from the surrounding ironstone. 
K 
