412 juiis. liuvi: im:ti:i{si:n 



Cymbella Cistula Hcmpr. Cl. S\ n. I. p ITii. V. 11 Syn. IM 11. Ii}>.13. 

 E. Iccl. 128 - W. Icel. 336. 



Conimoii fresli walcr species (O.slriip 101) samples. The spcciiiiens 

 fouiiil have probabI\ imi livi'd in ihe plares whcre Ihcy were Ibund, 

 bul liave becii accidenlallv ronvevod llierc. 



Cymbella naviculiformis Auersw. Cl. Syn. I. p. KIC). C anj*lica AS. 

 Atl. ri. 9. Ii,t^. ()3. 



E. Icel. L. 1)9. 111. 



Kolind in Iccland by Oslru]) in 52 samples from frcsb waler. It is 

 tbus a jiroHDnnccd bydiophilous species. Init evidcntly it can live in 

 ratber dry piaces. Tbe sample in wliicb I lound it in tbe livinj; state 

 was from a rock cleft wilb tiicklinj^ water wbere it j^rew amonj^ Xosloc 

 comniiinc. Tbe olber samj)le was from soil near a farm (Prasiola). 



Cymbella gracilis Habb. Cl. Syn. I, p. 109. V. H. Syn. PI. III, 

 ligs. 21-23. 



E. Icel. 123 - X. Icel. 161 - S. Icel. 295. 



Found by Østrup in 79 samples from fresb water. It must tbere- 

 fore be assumed to be a pronounced hydrophilous species. 



Cymbella ventricosa Kiitz. Cl. Syn. I. p. 168. V. H. Svn. PI. III, 

 fig. 16. 



E. Icel. 113. 114. 124 - N. Icel. L.? 135, 14(), L. 169, 217. 



Tilis very common sjiecies has a world-wide distribution in fresb 

 water. Østrup found it in Iceland in 247 sanijjles. Hence it must be 

 taken for granted tbal tbe few and small specimens I found in tbe 

 above-mcnlioned samples have bardly lived in these piaces. Sjjecimens 

 with endocbrnme were only found in one sample Xo. 169 . Tbis sample 

 originales from tbe shore of a lake wbere the ground was very damp. 

 Tbe species is thus beyond doubt a |)ronounced hydrophilous s|)ccies. 



Am})bor<i Elirh. 



Amphora veneta Kutz. Cl. Syn. II, p. 118. A. quadricostata. A. S. 

 Atl. Tab. 26. lig. 78-80. 



E. Icel. 7. 



Brackisb waler si)ecies wbiili, however. has occasionally been found 

 in fresb waler. tbus by Østrup, in 4 samples from Iceland. The spe- 

 cimens found in tbe sample were very small, one of tbem bad tbe 

 following dimensions: L. 15,4//. br. 6,o/<, sir. abl. 23 in 10//. 



