54 



M. YOKOYAMA. 



distant from one another ; corners of the base distinctly auriculate ; leaf 

 terminated by a single leaflet ; veins numerous, fine, rising at base, and 

 radiating and anastomozing ; thus forming nets which are long and sub- 

 parallel in the middle of the leaflet, shorter and polygonal towards the 

 apex and the margin. 



Dictyozamites indicus-F eistmante], Jurassic Flora of the Rajmahal 

 Group, in the Rajmahal Hills, p. 70, pi. XLVI, fig. 7, 8. Jurassic 

 Flora of the Rajmahl Group from Golapili, p. 180, pi. II, 5, 6. lieber 

 die indischen Cycadeengattungen Ptilophyllum Morris und Dictyo- 

 zamites Oldham, p. 18, pi. IV, fig. 7, 7a, 8, pi. V, fig. 1-4, pi. VI. 



Dictyopteris falcata and Dictyopteris falcata var. obtusifolia-Oldham 

 and Morris, The Fossil Flora of the Rajmahal Series, Rajmahal Hills, 

 Bengal, p. 38, pi. XXIV, fig. 1, la, pi. XXIV, fig. 2, 2a. 



This species is greatly variable in the form of the leaflets. Feist- 

 mantel had already united Morris' species and variety. The distinguish- 

 ing characters are the ending of the leaf at apex, the mode of attach- 

 ment of the leaflets to the rhachis, the basal ears, and the reticulation 

 of fine veins. The first two of these characters are unfortunately not 

 to be seen in our specimens, as most of them occur in an isolated 

 state. A single specimen was obtained with the rhachis preserved, 

 but the preservation is such that the important character of the 

 attachment of the leaflets is not distinctly observable. The basal ears 

 are very distinct in fig. 4, 5a, 6, 8 and 9. The leaflets are more or 

 less oblique with upper part often curved to one side. Fig. 5, PI. X, 

 represents a leaflet which has the apical portion most strongly falcate. 

 Fig. 7 shows one with obtuse apex, which corresponds to Feistman- 

 tel's 'short and blunt' while fig. 5, 8, and 10 represent his 'long 

 and falciform ' leaflets. These latter are all more or less sharp at 

 apex, and fig. 10 may indeed be said to possess an acuminate apex. 



Most of our leaflets seem to have been sessile, as we see no in- 



