FßOM KüZÜKE, KU, A WA, AND TOSA. 911 



also in great profusion. Fecopteris [ virgitiioisis and 7.amioph>jUum 

 Buchiduuiit aiujustifolia are also Potomac, and if the latter is really 

 identical with Dioonites ahietinus, a« Fontaine asserts, it occurs also in 

 the European Wealden. The two remaining f<n-ms, Fodozamitcs 

 IJUsiUus and Nilssoiiia JoJuistriipi are hitherto only Cretaceous, the 

 former being found in the Cenomanian of Bohemia, and the latter in 

 the Kome-ljeds of Greenland, considered by Heer as of Lower Cretaceous 

 age. Tluis, the greater part of the fossils point to the AVealden or to 

 the Lower Cretaceous. But as the AVenlden is generally looked u[)on as 

 the fresh-water e<piivalent of the lowest Cretaceous, I go a step further 

 than Prof. Xathorst, and sp.y that the plant-bearing beds of Közuke, Kii, 

 and Shikoku represent the wIkjIc Xeocomian series, corresponding to 

 the Potomac of America. This assertion is in jiccordance with their 

 geological position. On the one hand they show a close relationship to 

 the TrifjoiUK Sandstone of the Gaulto-Cenomanian. and on the other 

 to the so-called T(_)rinosu or Cidaris Limestone. Avhich has been consi- 

 dered as Up[)er Jurassic. As to Choja, which has yielded onlv I'ccop- 

 Icris Brutnüana and rtiloplniUuin cf. cutchense, it is ditücult at ])resent 

 t(j make any definite statement ; but the (occurrence of a Pecopteris so 

 characteristic of AVealden seems to sliow, in s[)ite of the other, that we 

 have here to deal witli strata which in all i)rob:ibilitv bel(jn<'- to the 

 same g-eoloo-ical formation a.s the (jther localities. 



In contrast to the Middle Jurassic flora of K;ig:i. a marked fcatiu'e 

 in the one above discussed, is the comparative rarity of species alreadv 

 found in (jtlier countries. This is no doubt due, not only to the pre- 

 ponderance of marine deposits in the early })ajT of the Creniceous 

 period and conse(pient sctircity in rocks containing vegetable reiiinins. 

 but als(j to the fai/t that the already known floras of this epoch sucli as 

 the Wealden and the Potomac belong to provinces widely distant from 



