;i,S(> .loiis. ijovK i'i:ri:nsr.\ 



mens iii each sumpk'. The locnlilies in wliiili 1 IniiiKi il were very 

 (lissimihir. so thai il is (iiniciill to {^aiii aiiy idea ol Ihc eonditions iimicr 

 whieh it thrives hesl. Tlie localities were: in\ri. naked j^roimd. ^^round 

 witli niosses. hhii^ 2 samples;. 



Anomoeoneis zellensis Grun. Cl. Syn. Il, |». 7. V. Ileurck, Syn. 

 PI. 12. Ii<^. 11. 



K. kel. 7. 



Hardly an aerial alga. On Ihe whole il is evidenlly rare in Iceland. 



Friislulid A^. 



Frustuiia vulgaris Thw. Cl. Syn. 1. j). 122. Vanheurtkia vulgaris 

 Y. H. Syn. PI. 17. 11^. G. 



K. Icel. 12:1 L.? 125 — N. Icel. 217. 21. S. 



The sj)ccies is very common in Iresh waler in Iceland Ostruj) 

 116 samples). I have not been able to demonstrale with cerlainty the 

 presence of specimens with cell contents in any of the above-mentioned 

 samples Hence it is hardly probable that it is capable of living a terre- 

 strial lile. 



Slaiironeis Elirb. 



Stauroneis agrestis Boye P. Boye Petersen 1915. p. 289, lij^. 9. 

 K. kel. 125 - N. Icel. L. 218. 



In the two samples mentioned, thcre occurred very small Slaiironeis 

 specimens which must be referrcd to the present s])ecies. One spccimen 

 measured in 1.24//. br. 4,6//, striæ very line. Still smaller specimens 

 occurred in the samples. 



Stauroneis anceps Miirb. Cl. Syn. 1, p. 147. 

 E. Icel. 123 - X. Icel. 140, 215. 



This species is hardly an aerial alffa. 1 found one larj^e spccimen 

 in sam|)le 123 1.125//, br. 23//, sir. 18 in l<)//\ and a smaller form in 

 samj)le 215. so small indeed that it approaches very near to Sagrcslis 

 Boye P. It occurred among desiccated algæ in sample 140derived from 

 a (iilch. 



©Stauroneis lapidicola Boye P. n. sp. 

 N'alva ovali-lanceolala, apicilnis oblusis. long. (i.i;//, lal. 3,1//, 

 striis invisibilibus, stauro marginem altingenle. Fig. 12. 



J'«-'^-. X. K-el. 217. 



Sliiiironeis 



I(ij)iilir<,l(t [ |,.,yj. Qpiiy sL'L'i\ two specimens ol' this small species, 



Hove I 11 sp '' 



(X l'JOO ''"' ^'^^y '^^'cre so characteristic that I do not doubt that they 



represent a species nol hitherlo describcd. They were found 

 on a stone in »Stora (ija- near .Mwatn, among Prusiola cris/nt. 



