EXPLANATION OF PLATE XVIII. 



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Fig. l,ProtopIiyllum multinerve, Lesqx 105 



Fig. 2, Protophyllum sternbergii, Lesqx 101 



Fig. 3, Protoj>byllum ? muclgci, Lesqx 106 



Fig. 4, Magnolia altcrnans, Heer 92 



