221 



118. C. decedens Reinsch. Plate VII fig. 9. 



Formå færoensis figuræ Reinschii (Algenfl. von. Franken tab. IX, 

 fig. cl) pioxima, dilTert incisura mediana tenuiore et minus profunda ; 

 cellula paullo major. 



Long. = 54 |m; lat. = 29; lat. isthm. = 21 fi; crass. = 19 [a. 



Seen in front view tliis form differs from that of Nordstedt 

 (Desm. arct. p. 38, tab. 8, lig. 41) in tlie more rounded angles of its 

 cell; in lateral view the apex of the semicell is more broadly 

 rounded, and in vertical view the outline is broad elliptical without 

 the swelling at the middle of each side. 



In gatherings from Kirkebokamp (Str.); and Nol so. 



Dr. Nordstedt told me that in Scotland he had collected a 

 form very similar to it. 



119. C. anceps Lund. 



Tilis species appears in collections from bare stony ground near 

 Trangisvaag (300 m.) (Syd.); and from mountain heights on Bord 6 

 (450 m.). 



Wille (1. c. p. 26) mentions liaving seen this species. 



120. C. granatum Bréb. 



Ralfs Brit. Desm. tab. 32, fig. 6. 



Seems to be rather common. Found in gatherings from Kirkebo- 

 kamp (Str.); Nolso; Sand (San do); Trangisvaag (Syd.); and in Plank- 

 ton from the lake in Vaags Ejde (Syd.). 



Formå fere similis figuræ Klebsii (Desm. Ostpreus. tab. III, fig. 23). 



Long. = 35 ;a; lat. = 25 /w; lat. isthm. = 7 ju. 



Kirkebokamp (Str.). 



121. C. læve Rab. 



In a collection of algæ from bare stony ground between Kvalbo 

 and Trangisvaag (200—300 m.) (Syd.) a Cosmarium was found which I 

 think may be referred to the above-named species; it is rather like Nord- 

 stedf s fig. 4, tab. XII in Desm. Ital. 



122. C. microsphinctum Nordst. |3 crispulum Nordst. 



A form very like Wille's formå »apicibus rotundatis« (Novaj. 

 Semlj. p. 38, tab. 12, fig. 23) but with a somewhat thinner mem- 

 brane was found in a gathering of algæ from mountain heights 

 on Bordo (450 m.). 



Long. = 43 fi; lat. = 27 fi. 



