PLATE 10 



FIG. 



PAGE 



MERIDION 



1-2-3 Meridiem circulare (Grev.) Ag 40 



DIATOMA 



4 Diatoma vulgare var. grande (Wm. Sm.) Grun 42 



5-6 Diatoma anceps (Ehr.) Kirchn 42 



7-8 Diatoma hiemale (Lyng.) Heih 42 



9-10 Diatoma vulgare Bory 42 



PLAGIOGRAMMA 



11 Plagiogramma tessellatum Grev 43 



12 Plagiogramma obesum Grev 43 



13 Plagiogramma pygma-um Grev 43 



14 Plagiogramma wallichianum Grev 43 



EUNOTOGRAMMA 



15 Eunotogramma Iseve Grun 33 



OPEPHORA 



16-19 Opephora schwartzii (Grun.) Petit 43 



17 Opephora pinnata var. lanceolata n. var 44 



18 Opephora pacifica (Grun.) Petit 43 



FRAGILARIA 



20-21 Fragilaria virescens Ralfs 44 



22-23 Fragilaria arctiea Grun 44 



24-25-27-28-29 Fragilaria undata Wm. Sm 44 



26 Fragilaria undata Wm. Sm., var.? 44 



30 Fragilaria construens (Ehr.) Grun 45 



31 Fragilaria harrisonii (Wm. Sm.) Grun 45 



34 Fragilaria capucina var. mesolepta Rab 45 



35 Fragilaria parasitica (Wm. Sm.) 45 



36 Fragilaria sp.? 45 



37 Fragilaria linearis Cstr 45 



RHAPHONEIS 



38 Rhaphoneis amphiceros Ehr 46 



39-40 Rhaphoneis amphiceros var. rhombica Grun 46 



41 Rhaphoneis belgica var. intermedia Grun 46 



SYNEDRA 



32-33 Synedra radians Kuetz 49 



