PLATE 21. 
A PETRIFIED NUT. GRIT AND IRONSTONE. 
FIG. 1 , 2 , 3 , 4 , 6, 6. 
PHYTOLITHUS (nuceiis) Fructus * nuce ovata 
acuminata trigona. S. t. 
\ fossil vegetable. The original a Fniit, containing a 
nut. The nut ovate, with the base rounded and marked 
with a small flat circle; the apex acuminate, ending m a 
sharp, angular point; and the sides furnished with three 
prominent longitudinal angles; acute, equidistant, and ter- 
minating in the point just mentioned. The form and 
nature of the integuments, which enclosed the nut, uncei 
tain — rarely occurring in the fossil. 
Not very common in Derbyshire f ; it is now and then 
found in the grit and ironstone; but, 1 believe, in no great 
* Drupae ? 
t More frequent in Lanc.ishire : I collected, some years back, In a stone 
quirrv near M%an, a considerable number of specimens, m no respect d.f- 
bs;: 
