101 



Tetraemorus Ralfs. 

 T. lævis Ralfs. 



ß. atteniiatus Wille. Wille I: pag. 58, Tab. XIV, fig. 77. 

 Lo 78—87,7, La 24—26, Li ?— 24. 



Атака, Kap Dalton. 



Boldt II: Tasiusak. 



Xanthidiura Ehrb. 



1. X. antilopæum Kütz. 



y. dimazum Nordst. Nordstedt И : pag. 38, Tab. I, fig. 19. 

 Lo 50, La 47, Li 13. Lo spin. с. 13. 

 Falkefjæld. 

 Borgesen I: Hekla Havn. 



2. X. cristatum Bréb. 

 Boldt II: Tasiusak. 



Lo 57, La sine acul. 60,8, 



3. X. fasciculatuin Ehrb. 

 Delponte I: Tab. XIII, flg. 20 

 Li 13, Lo acul. 16,9. 

 Falkefjæld. 



With regard to the dis- 

 tinction between the species 

 antilopæum and fasciculatum 

 \ shall refer to Borgesen 's 

 report (Borgesen I, p. 23); 

 noteven the number of spines 

 is always constant; I have 

 seen specimens with four pair of spines on one semicell, and 

 with six on the other (Fig. 6). 



Fig. 6. 



Xanthidium апШо'рзгьт Kütz. 



a: Cellula a fronte. Ь: Cellula a latere. 



Zygnemaceae, . 



Zygnema De By. 



7i. Cyanosporum Cleve. 



De Toni I: pag. 729. La veg. cell. 22^. Diam. Spor. 33,^ 



