COMPAEISOX WITH FLORA OF VALENCIENNES BASIN. 301 

 Table showing distribution in the Valenciennes Basin {Westphalian), etc. — Continued. 



Species. 



Upper 



Sphenophyllum ciineifoUum (Stb.) Zeill 



S. emarginaium Brongn 



5. majus Bronu 



Lepidodendron Britisii Ls. (L. Wortheni Ls.) 



L. rimosum Stb 



L. lanceolatum hs.. {L. lycopodioides Stb.?) 



L. scutatum JjX, (L. ophiurus Hiongn.) 



Lepidostrobus 2}rinceps Lx. {L. Gemteii Schiivip.) 



Lepidophyllum Jenneyi D. W. (£. triangulare Zeill.) .. 



Sigillaria camptotwnia Wood 



S. tessellata (Steinh.) Brongn 



S. orata Sauv 



Stigmaria verrucosa (Martin) S. A. Mill 



S. Evenii Lx 



Cordaiies communis Lx. (C horassifoUus (Stb.) Ung.). 

 Cordaianthus ovatus Lx. (C. Volkmanni (Ett.) Zeill.) . 



Identical species 



Supposed related species 



The comparative distribution of identical or closely related species 

 exhibited in tlie foregoing table is at once striking and instructive. A 

 glance at the columns shows that many among both identical and related 

 species are found in the middle zone. But the conspicuous and significant 

 fact is the occurrence of 24 or 25 of the 26 of the identical Missouri species 

 in the upper zone of the Franco-Belgian basin. If we take account of the 

 distribution of the related species, we find 21 of the 27 in the same zone. 

 Thus our flora has a very marked and preponderant affinity with the flora 

 of the zone of Bully- Grenay. 



The evidence afforded by the distribution of the species needs only to 

 be supplemented by a review of the profuse and admirably executed figures 

 of the species from the upper zone given in Professor Zeiller's great memoir 

 to insure a conviction that in that upper zone of the Valenciennes coal field 

 we find terranes of the age of the lower coals in Henry County, Missouri. 

 In fact, assuming a uniform distribution for the plants, there can be little 

 doubt that the floras are nearly synchronous. 



