FRESH-WATER DIATOMS FROM ICELAND 



71 



68 

 69 



70 

 71 

 72 

 73 

 74 

 75 

 76 

 77 



85 

 86 



87 

 88 



89 

 9(1 



91 

 92 

 93 



94 



99 



100 

 101 

 102 

 103 



Cist u la arctica . . . 



Caldogast. 



maculata . 



cuspidata 



cy in hi form is 



Khrcnbergi 



delecta 



gracilis 



helvetica 



heteroplcura min. 



78 incerta navic. 



79 lanceolata.. 



80 I cornuta 



81 ventricosa 



82 lapponica 



83 microcephala 



84 naviculiformis 



parva 



prostrata 



sinuata 



stauroneiformis.. 



turgida 

 ventricosa.. 



Denticula 



elegans 

 subtilis 

 tennis . 



Diatoma 



hiemale.. 



95 elongatum. 



96 



97 



98 



minus 

 ten ne . 



vulgare 



Diatomella 



Balfouriana 



Diploneis 



Boldtiana 



robusta . . . 



elliptica 



ovalis . 



