290 



nantheSj Diatoma, Epithemia, Eunotia, Melosira, Meridian, Nitz- 

 schia and Synedra. 



Among these, more markedly, Meridian (to the extent of 1 2 ^lo 

 in J. as against 1 ^/o in Z.), Nitzschia (17 *^/o as against 9 *^/o), 

 Achnanthes (21 ^lo as against 14 ^/o), Eunotia (12 ^/o as against 

 5 ^lo), Melosira (10 "/o as against 4 ^h), and the rest with a difference 

 in percentage of less than 2. 



Only in J. : FrustuUa (7 ^'o), Anomoeoneis and Pleurosigma 

 (each to the extent of 2 ^/o). 



Genera which do not contain forms "characterising" for "moors 

 and moorland ditches" are Asterionella, Rhoicosphenia, Stauroneis 

 and Stephanodiscus. 



Consequently, especially "characterising" in Z. are Gonipho- 

 nema, Cocconeis and Cymhella, and in J. : Meridian, Nitzschia, 

 ■Achnanthes, Eunotia and FrustuUa. 



The table on p. 261 demonstrates the foUowing facts: — 



More common in Zealand than Jutland from '■Hakes and stag- 

 nant water,'''' are forms of the genera Achnanthes, Cocconeis, Cyc- 

 lotella, Diatoma, Fragilaria, Meridian, Navicula, Nitzschia, Stepha- 

 nodiscus and Surirella. 



Among these, more markedly,, Fragilaria (to the extent of 

 23 ''/o in Z. as against Q^lo in J.), Navicula (10°/o as against 

 2 ®/o), Nitzschia (8 ^/o as against 2 ^/o), Synedra (17 ^lo as against 

 9 ^/o), Cocconeis (12 ^/o as against 6 *^/o), Achnanthes (8 ^/o as 

 against 5 '^lo), and the rest to the extent of 2 *'/o and under. 



Only in Z. : Amphora (2 ^/o) , Eunotia, Rhoicosphenia and 

 Stauroneis (each to the extent of 1 ^/o). 



More common in J. than Z. are Tabellaria (to the extent of 

 13 ^/o in J, as against 2 "/o in Z.), Epithemia (27 ^/o as against 

 18 ^/o), Melosira (14 ^/o as against 8 ^/o), Anomoeoneis (3 ^/o as 

 against 1 ^/o). 



Only in J. : FrustuUa and Pinnularia (each to the extent of 

 5 *^/o), Amphipleura and Asterionella (each to the extent of 2 ''/o). 



About as common in Z. as J. are Cymhella and Gomphonema 

 (each to the extent of 17 — 18^/o), and Mastogloia (1 — 2 ^/o). 



Genera which do not contain forms "characterising" for Hakes 

 and stagnant water'''' are Hantzschia and Pleurosigma. Consequently, 

 specially "characterising" in Z, are Fragilaria, Navicula and Syne- 

 dra, and in J. Tabellaria, Epithemia, FrustuUa and Pinnularia. 



