DESCRIPTIOlSr OF PLATES. PP. 129 



Plate XX. 



Figs. 1-3. Pecopteris, Candolleana. Brongt. 



" 1. A portion of a pinna showing fructilication. 



" 1*^. An enlarged pinnule of the same. 



" 2. A portion of a pinna from the lower part 



of the frond, showing the beginning of 

 the lobing of the pinnules. 



" 3. A portion of a pinna, showing more com- 



plex nerves than the normal pinnules. 



" 3". Enlarged pinnule of the same. 



" 4. Pecopteris Germari, var. cuspidata. Var. nov. 



" 4". Pinnules of the same, enlarged. 



" 5. Pecopteris Germari, var. crassinervis. Var. nov. 



" 5". Pinnule of the same, enlarged. 



'' 6-8. Pecopteris rarinervis, Spec. nov. 



" 7,8. Show portions from near the extremity of 



compound pinnae. 



" 6". Enlarged pinnules of the same. 



Plate XXI. 



Figs. 1,2. Pecopteris subfalcata, Spec. nov. 



" 1. Gives the normal form. 



" 1". Enlarged pinnules of the same. 



" 2. Gives an abnormal form. 



" 3. Pecopteris Pluckeneti. Brongt. Var. constricta. 



" 3". Enlarged pinnule of the same. 



" 4-5. Pecopteris Pluckeneti. Brongt. 



" 4". Enlarged pinnule of Fig. 4. 



Plate XXII. 



Figs. 1-5. Pecopteris dentata, Brongt. 

 " 1". Enlarged pinnules from the lower part of 



Fig. 1. 

 " 1^. Enlarged pinnules from the upper part of 



Fig. 1. 

 " 2. A form corresponding with Pecopteris plu- 



mosa of Brongt. 

 " 3, 4, 5. Give different forms of P. dentata. 



9 PP. 



