FRESH WATER AIG>C 



PLATE XV. 



\ 





*** 



' Jt ra<l C 000 



F, t I sridOGVR* MAJUSCULA 

 & SPIR06V OILUTA. 



t MM4M.AI* . 



* SPIROGYRA SETIFORMIS 



4. SPIROGYRA CRASSA 



MtSOCARPUS SCALARIS 



F.g e SPIROGYRA NHSIGNIS. 

 " 7. SPIROGYRA PARVI5PORA'. 

 - ZYCNEMA INSICNIS: 



