234 



204. S. sexcostatum Bréb. 



Long. — 41 [i; lat. = 35 //; lat. isthm. — \1 [i. 

 Gliversrejn near Thorshavn (Str.). 



205. S. spongiosum Bréb. var. perbifidu.m West. 



The specimens from the Færoes are very much like Liitke- 

 miillers form (Desm. Attersees, p. 29, tab. 9, fig. 15). 

 Long. := 54 |m; lat. ^ 43 «; lat. isthm. = 14 jm. 

 Ghversrejn near Thorshavn (Str.). 



206. S. acarides Nordst. 



Desm. Spetsb. p. 40, tab. VII, iig. 26. 



The specimens from the Færoes are quite like Nordstedt's figure 



(Desm. Spetsb. p. 40, tab. 7, fig. 26). 



They occurred in great abiindance in a gathering from mountain 

 heiglits (450 m.) on Bordo. 



207. S. oxyacantha f. torta n. f. Plate VIII, fig. 3. 

 Cellululæ a vertice visæ radiis evidenter tortis. 

 Long. = 30 // ; lat. = 33 ^i. 



Klakken near Klalisvig (Bordo). 



208. S. paradoxum Meyen. 



In Planliton from Sorvaagsvatn (Vaago); and lake near Ejde (Ost.). 



209. S. crenulatum (Niigl.) Delp. 

 Desm. subalp. tab. 12, fig. 1—11. 



Long. = 40 /^; lat. = fx; lat. isthm. =^ 16 (a. 

 Found in Plankton from Sorvaagsvatn (Vaago). 



210. S. Sebaldi Reinsch. 



The specimens from the Færoes are rather hke my form from 

 Greenland (Ferskvandsalg. fra Østgrønl. p. 30, tab. 2, fig. 31), the 

 arms or processes of the semicell seen in vertical view, however, 

 are somewhat longer and thinner and thereby it approaches var. 

 brasiliensis Borgs. (Desm. Brasil. p. 47, tab. 5, fig. 51). 



Long. = 54 //; lat. == 64 |U; lat. isthm. — 14 /m. 



In a gathering from Sand (San do). 



211. S. Arachne Ralfs. 



Found by Rostrup (Fær. Fl. p. 90). 



212. S. tetpacerum Kiitz. 



Already found by Rostrup (Fær. Fl. p. 90;. I have seen this species 

 in gatherings from Thorshavn (Str.); Khild^cn near Klaksvig (Bordo); 

 Skopen and Sand (San do). 



