[imwson] 



FOSSIL SI'ON(JES 



Tras.s. 18!MI. Skc. IV.— Pi atk I. 



I'k;. I. 



Fk;. 4. 



Fig. X.—l'foliinpoiKjia fitriiiit'iiKi. 



Fig. 2.— P. inononi'tnn. 



Fig. 3.— Do Showing ()S('»/i'))(, partly broken away. 



Fig. 4.— P. (etranenia. Seen in section with root. (Ail natural .size.) 



123 



