162 THE MEDALS OF OREATION. Cuap. VI. 
was shed naturally ; as shown in Lign. 55 a. These petioles 
were probably persistent for some years, as in the existing 
Lien. 56. CLATHRARIA LYELLII; } nat. 
Chalk-marl. Bonchurch, Isle of Wight. 
The summit of a stem garnished with petioles; the lower part shows the 
cicatrices left bythe removal of some of the petioles: a, the internal 
axis. 
Cycads. The opposite side of the stem to that represented 
is covered with elongated and flattened petioles. 
On the sea-shore bounded by cliffs of Wealden rocks, 
in the Isle of Wight, water-worn portions of stems of Clath- 
rariz are occasionally met with ; and these are impressed 
with the lozenge-shaped areas left by the petioles, as in the 
specimen, Lign. 57. Mr. Saxby, of Bonchurch, has favoured 
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