1 84 DICHOPTERIS. 



much discussion and need not be considered here. Feistmantel 

 describes certain plant remains from the Gondwana flora of 

 India, which closely resemble Zigno's species ; he prefers to go 

 back to Brongniart's Pachypieris, and extends the original definition 

 so as to make it embrace, not only plants with the ultimate 

 segments " enerviis vel uninerviis " 2 but those in which the veins 

 are more numerous. In Schenk's monograph on Die fossile Flora 

 der Grenzschichten .... a specimen is figured as Dichopteris 

 mcisa, Schenk, 3 but, as Feistmantel suggests, 4 the characters do 

 not seem to agree with Zigno's genus. The larger and more 

 perfect specimens of Dichopteris figured by Zigno 5 would seem to 

 favour the inclusion of such plants among the Filicina ; but, as 

 Schenk points out, 6 the fructification is too indistinct to be of 

 any taxonomic value. It is safer, therefore, while expressing 

 a bias towards the pteridophytic nature of the genus, to speak 

 of it as occupying a somewhat doubtful position. 



Dichopteris, sp. Cf. D. laevigata (Phill.). 7 



[PL XII. Fig. 6.] 



V. 3145. Part of a single pinna, showing the coriaceous 

 ultimate segments without any distinct venation. 



Cf. Dichopteris Visianica, Zig., D. lavigata (Phill.), and 

 Scleropteris Pomelii, Sap. 8 Ecclesbourne. Rufford Coll. 



1 Foss. Fl. Gond. vol. ii. p. 29. 



2 Brongniart (A. 3), Hist. veg. foss. p. 166. 



3 Scheuk (A. 1), p. 121, pi. xxviii. figs. 5-8. 



4 Loc. cit. p. 30. 



5 (1), pis. xii. and xiii. 



6 (A. 8), Schenk's Handbuch, p. 41. 



7 =Neuropteris laevigata, Phill., Pachypteris Icsvigata (Phill.), Scleropteris 

 l&vigata (Phill.). 



8 Saporta, loc. cit. pi. xlvii. 



