88 GLOSSOrTERIS. 



Secondary nervation acute, forming broad, oblong-polygonal meshes, 

 of approximately the same size throughout the lamina. 



G. formosa appears to be a narrow-leaved type of frond 

 corresponding to G. retifera or G. conspicua, in the same way as 

 G. angustifolia probably corresponds to G. indica. It is possible 

 that in each case both the narrow and broad-leaved fronds may 

 have belonged to the same plant. 



G. formosa is known only from the Raniganj group of the 

 Damuda division in India. 



Not represented in the British Museum collection. 



9. Glossopteris tortuosa, Zeiller. 



1902. Glossopteris tortuosa, Zeiller, Pal. Indica, n.s., vol. ii, p. 14, pi. iii, 

 figs. 2, la. 



Type. No. 7267, Mus. Geol. Surv. India, Calcutta. 



Frond of medium size, contracting gradually towards the base ; 

 median nerve strong, with longitudinal striations ; secondary nerves 

 thick, spreading, irregularly sinuate, forming on each side of the 

 midrib two series of large, polygonal meshes, the succeeding meshes 

 being narrower, more elongate, polygonal, or trapezoidal. 



Zeiller has recently founded this species on a single specimen 

 from India. It recalls the fronds of G. Browniana or G. indica, 

 but the median nerve is stronger and is longitudinally striated, while 

 the lateral nerves, which are flat and broad near the midrib, 

 thinning gradually towards the margin, are almost at right angles 

 to the midrib. The lateral nerves are sinuate, and anastomose at 

 intervals, giving rise to a network, of which the two series of 

 meshes next the midrib are broadly polygonal, the more distal 

 being narrower and more elongate, sometimes truncate, sometimes 

 narrowed to a point at their extremities. 



In their nervation, these fronds may be also compared with the 

 Indian leaves referred to Feistmantel's species G. damudica, which 

 is here included with G. ampla, Dana. Zeiller does not, however, 

 regard them as identical. 



Glossopteris tortuosa is known only from the Raniganj group of 

 the Damuda division in India. 



Not represented in the British Museum collection. 



