Vol. 59.] OCCURRENCE OF DICTYOZAMITES IN ENGLA.ND. 233 



large collections belonging to it, made in Argentina, had been 

 described by Dr. Kurtz and Dr. Bodenbender. Nor was this the only 

 interesting fact about the plant-life of Mesozoic times. In Upper 

 Palaeozoic days two very distinct floras co-existed : the Northern or 

 Lepidodendron- and Sigillaria-fliOr& of the British Coal-Measures, 

 and the Southern or Glossopteris-ftora, of Australia, India, South 

 Africa, and South America. Some slight intermixture of the floras 

 existed in the two last-named areas ; none had been detected in 

 Australia or India. But the earliest Mesozoic flora of Europe, the 

 Triassic, which differed completely from the Permian, contained 

 several forms characteristic of the Glossopteris-ftom, and very pro- 

 bably might have been derived from the latter. The Mesozoic flora, 

 as the Author had pointed out, prevailed up to the earlier part of 

 the Cretaceous Period, but was replaced in Upper Cretaceous times 

 by the modern flora, abounding in Angiosperms ; and this flora had 

 continued down to the present day. The Mesozoic flora was perhaps 

 derived from the Southern Hemisphere ; but the origin of the 

 Tertiary and recent flora was still one of the puzzles of Geology. 



Q. J. G. S. No. 234. 



