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128 PP. REPOKT OF PKOGEESS. FONTAINE & WHITE. 



Plate XVIII. 



Pigs. 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. 

 6. A portion from near the summit of a com- 

 pound pinna. 



*' 6". An enlarged pinna of the same. 



" 6. An ultimate pinna from near the base of 



the frond. Fig. 6". Enlarged pinnules of 

 the same with more complex nervation. 

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

 enlarged to show the flat nerves. 



Plate XIX. 



Figs. 1-7. Pecopteris Germari (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- 



u 



o^ 



mate pinnse. 



