0 
£ 47 ] 
MADREPORA. 
Coral^ mlh cavities Jamellofo-Jlellated. 
F I G. XXIL 
Porpita, Button-Jione, Round: one fide flat, 
the other convex : finely ftriated from the cen¬ 
ter to the circumference. The Jlrim are caufed 
by the edges of the thin perpendicular plates of 
which this coral confifts, and which are radiated 
from the center to the circumference. 
; ■ 
E. a variety of a conoid fliape ; there is ano¬ 
ther variety both fides of which are nearly flat^ 
Found in the gravel-pits: and upon the 
ploughed fields. 
F I G. LXIIL 
The furface elegantly marked with quinquan^ 
gular cells, which are formed by perpendicular 
thin plates, radiated from the center of each 
cell to their edges which are a little prominent: 
the lower part is of a conoid fhape marked with 
fine circular Jlrice, 
Found beneath the turf upon Hampton-down. 
Mr. 
