28 



Indiana University Studies 



Pike Lake 





Dur- 





A 



O 



8 



1 n 

 iU 





face 



M^eters 



M^eters 



Mieters 



M^eters 



M^eters 



Microcystis (1) . . . 



1,472 



2,408 



798 



206 



243 



35/ 



Microcystis (d)... 



275 



385 



233 



426 



1,789 



1,500 



Oscillatoria 



261 



233 



110 



87 



55 



67 



Melosira 



619 



715 



6,099 



2,174 



1,071 



165 



Ceratium 



577 

 68 



581 



371 



13 







Aneura 



55 



13 





Triarthra 



55 



13 



13 







Pediastrum 



165 



151 



495 



229 



137 



137 



Nauplii 



27 













Difflugia 



27 



41 



13 



13 



17 



13 



Eagle Lake (July 22, 1913) 





Sur- 

 face 



2 

 Me- 

 ters 



4 

 Me- 

 ters 



6 

 Me- 

 ters 



8 

 Me- 

 ters 



10 

 Me- 

 ters 



15 

 Me- 

 ters 



20 

 Me- 

 ters 



23 

 Me- 

 ters 



Microcystis, 1.. 

 Microcystis, d 



Ceratium 



Senedesmis. . . . 



16,189 

 514 

 274 



4,357 

 258 

 361 



1,066 

 240 

 564 



1,183 

 2,064 

 564 



321 

 16,601 

 91 



412 

 14,239 

 206 



91 



18,206 

 22 



22 



46,054 

 22 

 45 

 137 



114 



5,182 



Oscillatoria. . . . 

 Aneura 



651 

 857 

 137 

 102 

 68 

 60 



292 

 154 

 233 

 154 

 170 

 69 

 39 

 428 

 17 



236 

 153 

 256 

 20 



178 

 151 

 261 

 13 



275 

 45 

 527 



321 

 45 

 871 



91 



22 

 229 



Melosira 



206 





Tridencella 



Asterionella. . . 

 Hexarthra .... 

 Heterophrys.. . 















61 



82 

 1,343 



27 

 68 

 3,936 

 4,665 



68 



45 



22 

 32 

 298 











Fragillaria. . . . 

 Anabaena. . . . 



2,023 

 3,567 



1,994 

 1,444 



1,215 

 389 



298 



252 











