Proc. York. Geol. and Polyt. Soc, N S. Vol. VIII., PI. XIX. 
P 
Portion o f Tr a n s v e r s e S e ct i on of 
STEM OF CaLAM ITES, 
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rrh.c. — Mujl^Ub^ oortwoci Jm^-er 
o c . — O^uter c/^rtXcaL loLver 
