202 BRITISH DESMlDIACE^l. 



IRELAND. Donegal ! Mayo ! Galway ! Kerry ! 

 Dublin and Wicklow (Archer). Down ! 



Geogr. Distribution. France. Germany. Austria 

 and Galicia. Poland. Hungary. Italy. Norway. 

 Sweden. Finland. N. and S. Russia. Siberia. Spitz- 

 bergen. Nova Zembla. Faeroes. Ceylon. Siam. 

 New Zealand (var.). Australia. W., Central, and E. 

 Africa. Madagascar. United States. W. Indies. 

 Brazil. Paraguay. Uruguay. 



C.pseudopyramidatum is not so abundant as C. pyramidatum } 

 from which it is distinguished by its much smaller size and 

 by the presence of only one pyrenoid in the chloroplast of 

 each semicell. 



Nordstedt's " forma minor " and " forma major," which he 

 describes from Spitsbergen, we include within the general 

 range of size for this species. Lundell also mentions a 

 " forma major " length 52-64 /a breadth 32-40 /LL ; breadth 

 of isthmus 11-15 ju. This he states to be identical with Ralfs' 

 figs. 4 dj e, and /of C. pyramidatum. It is, however, difficult 

 to fix an arbitrary range of size for a "forma major" and 

 these dimensions should really be included with those given 

 under the description of the species. 



Var. stenonotum Nordst. (PI. LXIV, fig. 13.) 



C. pseudopyramidatum Lund, stibsp. stenonotum Nordst. Desm. Ital. 1876, 

 p. 32, t. 12, f . 8 ; De Toni, Syll. Alg. 1889, p. 946 ; Eoy & Biss. Scott. 

 Desm. 1894, p. 172. 



C. pyramidatum Breb. c. stenonotum Klebs, Desm. Ostpreuss. 1879, p. 31, 

 t. 3, f . 28-30. 



Cells mucb larger, upper part of semicells suddenly 

 narrowed, lateral margins below the apex slightly 

 retuse. With one pyrenoid in each chloroplast. 



Length 78-80 p; breadth 46-48 ^; breadth of isth- 

 mus 16-1 7 p.; thickness 28-30 /x. 



WALES.- -Capel Curig and Glyder Fawr, Carnarvon- 

 shire (Roy). 



SCOTLAND. Poolewe, Ross ; Aberdeen ; Kincardine ; 

 Ben Laoigh, Argyll (Roy $ Bissett). 



Geogr. Distribution. -Norway. Sweden. Italy. 

 Poland. N. Russia. Bornholm. Japan. Australia. 

 W. Indies. Paraguay. 



