568 PTERIDOSPERMS, ETC. [CH. 



Neuropteris heterophylla, Brongniart^ Figs. 354, E ; 371. 



This species is characteristic of the Lower Coal-Measures 

 of Britain ; it occurs also in the Middle Coal-Measures and is 

 a common type in Upper Carboniferous rocks in various parts 

 of the world. The fronds are large and tripinnate, the rachis 



Fio. 371. Neuropteris heWrophylla. From a specimen iu the Manchester 

 Museum. J uat. size. M.S. 



is often dichotomously branched and Cyclopteroid pinnules 



may occur on the petiole. The pinnules, 5—20 mm. in length 



and 3—8 mm. broad, have a rounded apex (fig. 354, E, p. 535). 



As shown in fig. 37 1 which represents a primary pinna, the 



1 Brongniart (22) A. PI. ii. fig. C. For synonymy, see Kidston (03) p. 773 ; 

 Zeiller (88) A. p. 201. 



