JURASSIC PLANTS FEOM KAGA, HIDA, AND ECHIZEN. 53 



Dictyoptcris falcata. Oldham, however, who had at first followed the 

 opinion of his colleague afterwards came to the conclusion, that the 

 plant in question is not a fern, as at first appeared, but a cycad near 

 to the genus Otozamites Br. His reasons were : 



Firstly, that the Indian leaflets possess not the slightest trace of a 

 midrib which in Dictyopteris is present as a " quasi-midrib or bifid 

 midrib," from which " all the veins of the fronds diverge in a flabel- 

 late or radiated form," while in the former " the strong nerves pass 

 out parallel to each other from the base of the leaf, and proceed to- 

 wards the apex in nearly right lines interrupted only by the anasto- 

 mozing or reticulating cross nerves, which pass from one to the other: 

 the areolae thus become subquadrangular, not hexagonal." 



Secondly, that the texture of the leaflets is coriaceous. 



Thirdly, that the equal leaflets are regularly disposed along a 

 rhachis which is provided with a terminal leaflet. 



And then he proposed for the Indian plant the new generic name 

 of Dictyozamites. 



Dr. Stur of Vienna also came to the same conclusion by examin- 

 ing the figures of this plant. 



The above view of these two eminent men has also been adopted 

 by Dr. Feistmantel who fully treats of this subject in his "Indischen 

 Cycadeengattungen Ptilophyllun and Dictyozamites " (p. 17). 



I possess a set of leaflets from Kaga and Hida, which I treat 

 under the name of 



36. Dictyozamites indicus Feistm. var. distans m. 

 PI. X, fig. 4-10. PL XI, fig. 5. 



Leaf simple, elongated ; leaflets either short and blunt, or long, 

 falciform, and acute at apex; attached to the rhachis with, the middle 

 of the base which is either very shortly petioled or quite sessile and 



