1911.] NATURAL SCIENCES OF PHILADELPHIA. 21 



Explanation of Plates I-V. 



Plate I. — -Portion of leaf of Podozamites formosus sp. now Natural size. 



Plate II. — Leaf of Zamites velderi sp. now Natural size. 



Plate III. — Portion of small branch of Palissya diffusa (Emmons). Natural 

 size. 



Plate IV. — Small branches, bearing ultimate branchlets, of Palissya obtusa 

 sp. now Natural size. 



Plate V. — Branch of Cheirolepis latus sp. now, showing the varying shape of 

 branchlets and the scars left by the fall of former branchlets. NaUiral size. 



