TJENIOPTEKIS. 121 



Tceniopteris is essentially a Mesozoic type of frond in that the 

 genus reaches its maximum development in Triassic and Jurassic 

 times, and extends to the Lower Cretaceous period. It makes its 

 first appearance, however, in the higher horizons of the Upper 

 Carboniferous, and in the Permian rocks of Europe and elsewhere 

 in the Northern Hemisphere, as well as in the Permo-Carboniferous 

 beds of India, ? Australasia, and South Africa. 



So far we have no knowledge of the fructification of any of the 

 Palaeozoic fronds. Zeiller ' has, however, recently described the 

 fructification of a certain Triassic species, which presents characters 

 closely identical with those of recent members of the Marattiacece. 

 It is possible, however, that other fronds included in this genus, 

 in the wide sense adopted here, may eventually prove to be more 

 closely related to the Cycadean stock than to the true Ferns. 



1. Tseniopteris danaeoides (Royle). 



(PL V, Fig. 1.) 



1833. Glossopteris danceoides, Royle, Must. Bot. Hiraal. Mounts., p. xxix*, 



pi. ii, fig. 9. 

 1836. Aspidites danceoides, Goppert, Die Foss. Farn., p. 352. 

 1850. Tceniopteris danceoides, M'Clelland, Rep. Geol. Surv. India, p. 56, 



pi. xv, figs. 1, la, lb. 

 Pecopteris danceoides, linger, Gen. et Spec. Plant, foss., p. 170. 

 1876. Tceniopteris danceoides, Feistmantel, Rec. Geol. Surv. India, vol. ix, 



pt. 3, p. 74. 

 Macrotceniopteris danaoides, Feistmantel, ibid., vol. ix, pt. 4, p. 137. 

 M. danceoides, Feistmantel, Jouru. Asiat. Soc. Bengal, vol. xlv, pt. 2, 



p. 365, pi. xix, figs. 1, la, 2 ; pi. xxi, fig. 1. 

 1880. M. danceoides, Feistmantel, Flora Goudw. Syst., vol. iii, pts. 2, 3, 



p. 88, pi. xx a; pi. xxiA, figs. 1, 2. 

 1886. M. danceoides, Feistmantel, ibid., vol. iv, pt. 2, p. 24, pi. ivA, figs. 2, 3. 

 1893. M. danceoides, Oldham, Man. Geol. India, 2nd pi. opp. p. 162. 

 1901. M. danceoides, Arber, Geol. Mag., dec. iv, vol. viii, p. 548. 



Type. V. 4191, Geol. Dept. British Museum (Nat. Hist.). 



Frond large, elliptical or oblong, petiolate, membranous or 

 sub-coriaceous. Midrib thick. Lateral nerves arising at an acute 

 angle, and almost immediately bending towards the margin in 



1 Zeiller (02 3 j, p. 63. 



