XEUKOPTERIDIUM. 115 



Type. No. 5320, Mus. Geol. Surv. India, Calcutta. 



Frond broadly ovate or sub-rhoniboidal, unsymmetrical. Apex 

 acuminate. Frond with a slight median furrow, but without a 

 midrib. Nervation radiating from the base, forming broad, oblong, 

 hexagonal or polygonal meshes. 



These characters are based on two imperfect fronds described 

 by Feistmantel from the Raniganj Group, India, which, if they 

 are correctly assigned to this genus, differ from G. cyclopteroichs 

 chiefly in the large size of the meshes. G. Whittiana, among 

 Gangamopterids, appears to correspond to Glossopteris conspicua 

 among Glossopterids, in the breadth of the meshes of the network. 



Not represented in the British Museum collection. 



5. Gangamopteris (?) buriadiea, Feistmantel. 

 (Text-tig. 27a, p. 112.) 



1879. Gangamopteris (?) buriadiea, Feistmantel, Flora Gondw. Syst., vol. iii, 



pt. 1, p. 15, pi. xviii, figs. 1, 2, la. 

 1881. G. (?) buriadiea, Feistmantel, ibid., vol. iii, pt. l, Suppl.', p. 54, 



pi. xxx, tig. 4. 

 1886. G. cf. buriadiea, Feistmantel, ibid., vol. iv, pt. 2, p. 33, pi. viiiA, 



fig. 7. 

 1893. G. buriadiea, Oldham, Man. Geol. India, p. 102. 



Type. Nos. 5023-4, Mus. Geol. Surv. India, Calcutta. 



Feistmantel described this species as follows: — Frond pinnate, 

 leaves hmeeolate-spathulate, truncated. Nerves radiating from the 

 attenuated base, somewbat strong, bifurcating, and anastomosing, 

 forming very erect, long, and narrow meshes. 



The shape and nervation of this frond, especially the erect 

 course of the nerves, recall some of the leaves included under 

 Xoeygerathiopsis Ilislopi (Bunb.), from which it differs chiefly in 

 the anastomosing nervation. There is no real evidence that these 

 leaves formed portions of a pinnate frond, as Feistmantel has 

 suggested. 



G. (?) buriadiea is known only from the Karharbari Beds of India. 



Not represented in the British Museum collection. 



Genus NEUROPTERXDIUM, Sehimper, 1869. 

 [Traite, vol. i, p. 447.] 

 Frond simply pinnate, pinnules lobed or entire, usually orbicular, 

 iuserted by the whole base or by the lower portion of the base. 



