128 PP. RErORT OF PROGRESS. FONTAINE & WHITE. 



Plate XVIII. 



Figs. 1-6, Pecopteris platynervis, Spec. nov. 



" 1. Gives the normal pinnules from the middle 



part of the frond. 



" 2. A compound pinna of the normal form. 



Fig. 2". Pinnules of the same enlarged. 

 Fig. 2''. Gives a portion of the same pin- 

 nules still more enlarged, to show the 

 double character of the lateral nerves. 



" 3. A portion of a compound pinna from the 



upper part of the frond. 



" 3". An enlarged pinna of the same. 



" 4. The summit of a compound pinna. 



" 5. A portion from near the summit of a com- 



pound pinna. 



" 5". An enlarged pinna, of the same. 



" 6. An ultimate pinna from near the base of 



the frond. Fig. 6". Enlarged i:)innules of 

 the same with more comjDlex nervation. 

 Fig. 6*. A fragment of the same still more 

 enlarged to show the flat nerves. 



Plate XIX. 



Figs. 1-7. Pecopteris German (Weiss). Font. & White. 



'* 1. A compound pinna from the upper part of 



the frond. 



" 2. A portion of the lower part of the frond. 



'* 2°. Enlarged ultimate pinna of the same. 



" 3. A small fragment of an ultimate pinna from 



the lower part of the frond. 



" 3*. A pinnule of the same enlarged. 



" 4. The summit of a compound pinna. 



" 5. The basal portion of the same. 



" 6. A portion from the summit of the frond. 



" 6". Enlarged pinnules of the same. 



" 7. Summit of compound pinna, showing a 



more distant arrangement of the ulti- 

 mate x>innae. 



