198 Mr. W. West and Dr. G. S. West. [Oct; 30, 



Fig. 5. Fig. 6. 



Maps of British Islands, to show (fig. 4) areas with Eainfall over 40 inches ; fig. 5, distri- 

 bution of rich and very rich Desmid-areas, characterised by the western types 

 mentioned (pp. 201 and 202) ; fig. 6, distribution of Older Palaeozoic and Archaean 

 rocks. 



Note. — The Desrnid-flora of the central and south-eastern counties of Ireland is very 

 imperfectly known. Notice the falling off in the Desmid-flora of Skye in fig. 5, corre- 

 sponding with the absence of Archaean rocks indicated in fig. 6. 



