MESOZOIC PLANTS FROM NAGATO AND BITCHU. 7 



Primary pinnœ elongated, deeply pinnatifid. Secondary pinnse 

 elongated, mostly inclined a little forward, but sometimes going 

 off from the rachis nearly at right angles, rigid or slightly bent 

 forward or even a little flexuous, mostly separated from one an- 

 other by a greater or less interval, alternate or subopposite, 

 gradually diminishing in length toward the front, until at last 

 they become mere lobes of the primary pinnœ, lobed. Lobes in 

 the posterior pinnœ ovate or ovately lanceolate with very deep 

 incisions between them, crenate at margin, obtusely pointed at 

 apex, while those in the anterior pinnœ become shorter, with 

 shallower incisions, entire and more blunt, so that in the most 

 anterior ones they change into mere crenations and then finally 

 disappear. Eachis of the primary as well as of the secondary 

 piunse slender. Midrib of the lobes distinct, but weak, somewhat 

 zigzag, evanescent. Lateral veins forming polygonal nets within 

 which there are still smaller ones. Veins in the lobed wings 

 similar to those of the lobes of the pinnse. Fertile pinnœ like 

 sterile ones, with numerous, crowded, more or less rounded sori 

 on the finer veins. 



When I first described this species, I had only a single 

 piece of stone on which was preserved a part of two consecutive 

 pinnae which I then took for the primary ones. But now on 

 examining the excellent specimens collected by Mr. Inouye, I 

 find them to be the secondary pinnse which belong to the 

 posterior portion of the frond. Figs. 5 and 7 in pi. I re- 

 present secondary pinnse probably belonging to the middle 

 portion of a primary pinna, while fig. 1, pi. I shows its terminal 

 portion. 



This plant seems to be not so rare, as was at first sup- 

 posed. 



